8X8 INC /DE/ - Annual Report: 2014 (Form 10-K)

We maintain a call center at our headquarters in San Jose, California and have a staff of more than 100 employees and contractors that provide customer service and technical support to customers. In addition, we have outsourced some customer support activities to third parties. Customers who access our services directly through our web site receive customer service and technical support through multilingual telephone communication, web-based and "chat" sessions, and e-mail support.

We are a party to telecommunications interconnect and service agreements with VoIP providers and PSTN telecommunications carriers, such as Level3 Communications, Verizon Communications and Inteliquent. Pursuant to these agreements, VoIP calls originating on our network can be terminated on other VoIP networks or the PSTN. Correspondingly, calls originating on other VoIP networks and the PSTN can be terminated on our network.

The UCC in the cloud market is characterized by rapid technological changes and advancements. Accordingly, we make substantial investments in the design and development of new products and services, as well as the development of enhancements and features to our existing products and services. Future development also will focus on the use and interoperability of our products and services with emerging audio and video telephony standards and protocols, quality and performance enhancements to multimedia compression algorithms, support of new customer premise equipment, new unified software services and the enhancement of existing products and services that are essential to our success.

We currently employ more than 75 individuals in research, development and engineering activities in our facilities in San Jose, California as well as outsourced software development consultants. Research and development expenses in each of the fiscal years ended March 31, 2014, 2013 and 2012 were $11.6 million, $8.1 million and $6.7 million, respectively.

VoIP and other communications and collaboration services, like ours, have been subject to less regulation at the state and federal levels than traditional telecommunications services. Providers of traditional telecommunications services are subject to the highest degree of regulation, while providers of information services are largely exempt from most federal and state regulations governing traditional common carriers. The FCC has subjected VoIP service providers to a smaller subset of regulations that apply to traditional telecommunications service providers and has not yet classified VoIP services as either telecommunications or information. The FCC is currently examining the status of VoIP service providers and the services they provide in multiple open proceedings. In addition, many state regulatory agencies impose taxes on VoIP services, and certain states take the position that offerings by VoIP providers are intrastate telecommunications services and therefore subject to state regulation. These states argue that if the beginning and end points of communications are known, and if some of these communications occur entirely within the boundaries of a state, the state can regulate that offering. We believe that the FCC has preempted states from regulating VoIP offerings in the same manner as providers of traditional telecommunications services. However, this issue has not been resolved definitively as a matter of law, and it remains possible that the FCC could determine that such services are not information services, or that there could be a judicial or legislative determination that the states are not preempted from regulating VoIP services as traditional telecommunications services. We cannot predict how this issue will be resolved or its future impact on our business at this time.

The effect of any future laws, regulations and orders on our operations, including, but not limited to, our cloud-based communications and collaboration services, cannot be determined. But as a general matter, increased regulation and the imposition of additional funding obligations increases service costs that may or may not be recoverable from our customers, which could result in making our services less competitive with traditional telecommunications services if we increase our prices or decreasing our profit margins if we attempt to absorb such costs.

8

In addition to regulations addressing Internet telephony and broadband services, other regulatory issues relating to the Internet, in general, could affect our ability to provide our services. Congress has adopted legislation that regulates certain aspects of the Internet including online content, user privacy, taxation, liability for third party activities and jurisdiction. In addition, a number of initiatives pending in Congress and state legislatures would prohibit or restrict advertising or sale of certain products and services on the Internet, which may have the effect of raising the cost of doing business on the Internet generally.

Federal, state, local and foreign governmental organizations are considering other legislative and regulatory proposals that would regulate and/or tax applications running over the Internet. We cannot predict whether new taxes will be imposed on our services, and depending on the type of taxes imposed, whether and how our services would be affected thereafter. Increased regulation of the Internet may decrease its growth and hinder technological development, which may negatively impact the cost of doing business via the Internet or otherwise materially adversely affect our business, financial condition and results of operations. Please refer to Part I, Item 1A. "Risk Factors" for a discussion of regulatory risks, proceedings and issues that could adversely affect our business and operating results in the future.

Our ability to compete depends, in part, on our ability to obtain and enforce intellectual property protection for our technology in the United States and internationally. We currently rely primarily on a combination of trade secrets, patents, copyrights, trademarks and licenses to protect our intellectual property. As of March 31, 2014, we have been awarded 92 United States patents, more than 60 of which we currently hold and which we expect to expire between 2014 and 2032. We have additional United States and foreign patents pending. We cannot predict whether our pending patent applications will result in issued patents.

To protect our trade secrets and other proprietary information, we require our employees to sign agreements providing for the maintenance of confidentiality and also the assignment of rights to inventions made by them while in our employ. There can be no assurance that our means of protecting our proprietary rights in the United States or abroad will be adequate or that competition will not independently develop technologies that are similar or superior to our technology, duplicate our technology or design around any of our patents. In addition, the laws of foreign countries in which our products are or may be sold do not protect our intellectual property rights to the same extent as do the laws of the United States. Our failure to protect our proprietary information could cause our business and operating results to suffer.

We are also subject to the risks of adverse claims and litigation alleging infringement of the intellectual property rights of others. Such claims and litigation could require us to expend substantial resources and distract key employees from their normal duties, which could have a material adverse effect on our operating results, cash flows and financial condition. The communications and software industries are subject to frequent litigation regarding patent and other intellectual property rights. Moreover, the VoIP service provider community has historically been a target of patent holders. There is a risk that we will be a target of assertions of patent rights and that we may be required to expend significant resources to investigate and defend against such assertions of patent rights. For information about specific claims, please refer to Part I, Item 1A, Risk Factors - "Our infringement of a third party's proprietary technology could disrupt our business" and Part I, Item 3. "LEGAL PROCEEDINGS."

We rely upon certain technology, including hardware and software, licensed from third parties. These licenses are on standard commercial terms made generally available by the companies providing the licenses. To date, the cost and terms of these licenses individually has not been material to our business. There can be no assurance that the technology licensed by us will continue to provide competitive features and functionality or that licenses for technology currently utilized by us or other technology which we may seek to license in the future will be available to us on commercially reasonable terms or at all, however. The loss of, or inability to maintain, existing licenses could result in shipment delays or reductions until equivalent technology or suitable alternative products could be developed, identified, licensed and integrated, and could harm our business.

Most of our customers and substantially all of our revenues are in the U.S. Revenue from customers outside the United States was not material for the fiscal years ended March 31, 2014, 2013 and 2012. We have only one reportable segment. Financial information relating to revenues generated in different geographic areas are set forth in Note 7 to our consolidated financial statements contained in Part II, Item 8 of this Report.

9

Employees

As of March 31, 2014, our workforce consisted of 484 employees. None of our employees are represented by a labor union or are subject to a collective bargaining arrangement.

Our executive officers as of the date of this report are listed below.

Vikram Verma, Chief Executive Officer. Vikram Verma, age 49, has served as Chief Executive Officer since September 2013 and as a director since January 2012. From October 2008 through August 2013, Mr. Verma was President of Strategic Venture Development for Lockheed Martin. From 2006 through 2008, Mr. Verma was President of the IS&GS Savi Group, a division of Lockheed Martin. Mr. Verma received a B.S.E.E. degree from Florida Institute of Technology, an M.S.E. degree from the University of Michigan in electrical engineering, and a graduate degree of Engineer in Electrical Engineering from Stanford University.

Bryan Martin, Chairman and Chief Technology Officer. Bryan Martin, age 46, has served as Chairman of the Board of Directors since December 2003, has served as the Chief Technology Officer since September 2013 and as a director since February 2002. From February 2002 to September 2013, he served as the Chief Executive Officer. From March 2007 to November 2008, and again from April 2011 to December 2011, he served as President. From February 2001 to February 2002, he served as our President and Chief Operating Officer. He served as our Senior Vice President, Engineering Operations from July 2000 to February 2001 and as Chief Technical Officer from August 1995 to August 2000. He also served as a director of the Company from January 1998 through July 1999. In addition, Mr. Martin served in various technical roles for the Company from April 1990 to August 1995. He received a B.S. and an M.S. in Electrical Engineering from Stanford University.

Dan Weirich, Chief Financial Officer. Dan Weirich, age 40, has served as our Chief Financial Officer since July 2006. From November 2008 to March 2011, Mr. Weirich also served as our President. From June 2006 to July 2006, Mr. Weirich served as our Acting Chief Financial Officer. He was our Vice President of Operations from April 2006 to June 2006 and Director of Strategic Sales from March 2004 to April 2006. Prior to joining us, Mr. Weirich served in various roles for iAsiaWorks, Qwest Communications and Phoenix Network. He received a B.S. in International Business from the University of Colorado at Boulder.

Darren Hakeman, Senior Vice President of Product and Strategy. Darren Hakeman, age 44, has served as our Senior Vice President of Product and Strategy since September 2013. From 2009 to 2013, Hakeman worked as a strategic advisor to leading Silicon Valley companies and emerging start-ups including Authentication Metrics, Inc. (now Agari), Blackfire Research, and a major global security company. Prior to 2009, he served as Senior Vice President of Operations for a SaaS Business Unit of Lockheed Martin that emerged following Lockheed's acquisition of Savi Technology, Inc. He received a B.S. and an M.S. in Electrical Engineering from Stanford University.

Huw Rees, Senior Vice President of Business Development. Huw Rees, age 53, has served as Senior Vice President of Business Development and Vice President of Business Development since November 2008. From January 2001 to November 2008, Mr. Rees served as our Vice President, Sales and Marketing. He served as the Chairman and Chief Executive Officer of the Company's wholly owned subsidiary, Centile, Inc., from July 2001 until September 2003. Additionally, he served as Vice President, Sales and Business Development of Centile from March 2001 to July 2001. He served as Vice President, Sales of the Solutions Group of the Company from August 2000 until February 2001 and as Director, North American Sales of the Company from April 1999 to August 2000. He previously worked at Mitel Corporation as Sales Manager of the Western Region and also in sales management roles at GEC Plessey Inc. and Marconi PLC. He received a B.Sc. (Hons) from the University of Manchester, Institute of Science and Technology in Electrical and Electronic Engineering and a M.B.A. from the University of LaVerne.

If any of the following risks actually occur, our business, results of operations and financial condition could suffer significantly.

10

Our success depends on the growth and customer acceptance of our services.

Our future success depends on our ability to significantly increase revenue generated from our cloud communications and collaboration services to business customers, including SMBs and mid-market and larger distributed enterprises. To increase our revenue, we must add new customers and encourage existing customers to continue their subscriptions on terms favorable to us, increase their usage of our services, and purchase additional services from us. For customer demand and adoption of our cloud communications and collaboration services to grow, the quality, cost and feature benefits of these services must be sufficient to cause customers to adopt them. For example, our cloud telephony and contact center services must continue to evolve so that high-quality service and features can be consistently provided at competitive prices. As our target markets mature, or as competitors introduce lower cost and/or differentiated products or services that are perceived to compete with ours, our ability to sell new customers and obtain renewals from existing customers could be impaired. As a result, we may be unable to extend our agreements with existing customers or attract new customers or new business from existing customers on terms that would be favorable or comparable to prior periods, which could have an adverse effect on our revenue and growth.

Historically, our core service offerings have been our cloud telephony and contact center services, which contributed a substantial majority of our revenues in fiscal years ended March 31, 2014, 2013 and 2012. Marketing and selling new and enhanced features and services, and additional communications and collaboration offerings, may require increasingly sophisticated and costly sales efforts. Similarly, the rate at which our customers purchase new or enhanced services depends on a number of factors, including general economic conditions and their reactions to any price changes related to these additional features and services. If our efforts to upsell to our customers are not successful and negative reaction occurs, our business may suffer.

To support the successful marketing and sale of our services to new and existing customers, we must continue to offer high-quality education and customer support. Providing this education and support requires that our customer support personnel have specific technical knowledge and expertise, making it more difficult and costly for us to hire qualified personnel and to scale up our support operations due to the extensive training required. The importance of high-quality customer support will increase as we expand our business and pursue new mid-market and distributed enterprise customers. If we do not help our customers quickly resolve post-deployment issues and provide effective ongoing support, our ability to sell additional functionality and services to existing customers will suffer and our reputation with existing or potential customers will be harmed.

Furthermore, we operate in an industry that is subject to significant federal and state regulation in the United States and regulation by various governments and governmental bodies in other countries in which we offer our communications and collaboration services. Regulations may impede the growth of our business, impose significant additional costs, and require substantial changes to software and other technology. Also, new regulations may be adopted that materially reduce demand for our services by businesses.

We currently derive a minority of our revenues from sales of our cloud communications and collaboration services to mid-market and larger distributed enterprises, but we believe penetrating these customers is key to our future growth. As we target more of our sales efforts to mid-market and larger distributed enterprises, our sales cycle may become more time-consuming and expensive, we may encounter pricing pressure and implementation and customization challenges, and revenue recognition may be delayed for some complex transactions, all of which could harm our business and operating results. In this market segment, the customer's decision to use our service may be an enterprise-wide decision and, if so, these types of sales would require us to provide greater levels of education regarding the use and benefits of our service, as well as education regarding privacy and data protection laws and regulations to prospective customers with international operations. As a result of these factors, these sales opportunities may require us to devote greater sales support and engineering services resources to individual customers, driving up costs and time required to complete sales and diverting our own sales and engineering resources to a smaller number of larger transactions, while potentially delaying revenue recognition on transactions for which we must meet technical or implementation requirements. Furthermore, we may invest significant time and resources with no assurance that a sale will ever be made. We also face challenges building and training an integrated sales force capable of fully addressing the services and features contained in all of the components in our communications and collaboration suite, as well as a staff of expert engineering and customer support personnel capable of addressing the full range of installation and deployment issues that can arise with a comprehensive suite of services like ours. Also, we have only limited experience in developing and managing sales channels and distribution arrangements for larger businesses. If we fail to effectively execute our strategy to

11

target mid-market and larger distributed enterprises, our results of operations and our overall ability to grow our customer base could be materially and adversely affected.

In addition, larger customers may demand more features, integration services and customization. We have a limited history of selling our services to larger businesses and have experienced and may continue to experience new challenges in providing our cloud communications and collaboration services to large customers. If a customer is not satisfied with the quality of work performed by us or a third party or with the type of services or solutions delivered, then we might incur additional costs to address the situation, the profitability of that work might be impaired, and the customer's dissatisfaction with our services could damage our ability to obtain additional work from that customer. In addition, negative publicity related to our customer relationships, regardless of its accuracy, could further damage our business by affecting our ability to compete for new business with current and prospective customers.

The business of cloud communications and collaboration services is competitive, and we expect it to become increasingly competitive in the future. We may also face competition from large Internet companies, any of which might launch its own cloud-based business communications services or acquire other cloud-based business communications companies in the future.

In connection with our cloud telephony services, we face competition from incumbent telephone companies, cable companies and alternative voice and video communication providers, including other providers of cloud telephony services. Because most of our target customers are already purchasing communications services from one or more of these providers, our success is dependent upon our ability to attract these customers away from their existing providers. The incumbent telephone companies are our primary competitors in cloud communications and collaboration. These competitors include AT&T, CenturyLink and Verizon Communications as well as rural incumbents, such as Windstream. In addition, in connection with all of our collaboration and communications services, we face competition from traditional private branch exchange, or PBX, providers, including Cisco Systems and Avaya and other providers of cloud telephony and contact center services, such as Comcast, inContact, Microsoft and RingCentral.

Many of our current and potential competitors have longer operating histories, significantly greater resources and brand awareness, and a larger base of customers than we have. As a result, these competitors may have greater credibility with our existing and potential customers. They also may be able to adopt more aggressive pricing policies and devote greater resources to the development, promotion and sale of their products than we can to ours. Our competitors may also offer bundled service arrangements that offer a more complete or better integrated product to customers. Competition could decrease our prices, reduce our sales, lower our gross profits or decrease our market share. In addition, our customers are not subject to long-term contractual commitments to purchase our services and can terminate our service and switch to competitors' offerings on short notice.

Given the significant price competition in the markets for our services, we are at a significant disadvantage compared with many of our competitors, especially those with substantially greater resources who may be better able to withstand an extended period of downward pricing pressure. The adverse impact of a shortfall in our revenues may be magnified by our inability to adjust our expenses to compensate for such shortfall. Announcements, or expectations, as to the introduction of new products and technologies by our competitors or us could cause customers to defer purchases of our existing products, which also could have a material adverse effect on our business, financial condition or operating results.

As a subscription-based business, we recognize revenue over the term of each of our contracts, which generally range from one to five years. As a result, much of the revenue we report each quarter results from contracts entered into during previous quarters. Consequently, a shortfall in demand for our cloud communications and collaboration services or a decline in new or renewed contracts in any one quarter may not significantly reduce our revenue for that quarter but could negatively affect our revenue in future quarters. Accordingly, the effect of significant downturns in new sales or cancellations of our services and subscriptions from new customers or for additional services from existing customers will impact our ongoing monthly recurring revenue but will not be reflected fully in our operating results until future periods. Our revenue recognition model also makes it difficult for us to rapidly increase our revenue through additional sales in any period, as revenue from new customers must be recognized over the applicable term of the contracts.

12

We have a history of losses and are uncertain of our future profitability.

We recorded operating income of $3.1 million for the fiscal year ended March 31, 2014 and ended the period with an accumulated deficit of $106.7 million. We recorded operating income adjusted for discontinued operations of approximately $22.7 million and $8.6 million for the fiscal years ended March 31, 2013 and 2012, respectively. Although we have achieved operating income in each of our four most recent fiscal years, we suffered operating losses in each of the three prior fiscal years and may incur operating losses in the future, which may be substantial. As we expand our geographic reach and service offerings, and further invest in research and development and sales and marketing, we will need to increase revenues in order to generate sustainable operating profit. Given our history of fluctuating revenues and operating losses, we cannot be certain that we will be able to maintain operating profitability on an annual basis or on a quarterly basis in the future.

Our customers generally do not have long-term contracts with us and may discontinue their subscriptions for our services after the expiration of their subscription period, which range from one to five years. In addition, our customers may renew for lower subscription amounts or for shorter contract lengths. We may not accurately predict cancellation rates for our customers. Our cancellation rates may increase or fluctuate as a result of a number of factors, including customer usage, pricing changes, number of applications used by our customers, customer satisfaction with our service, the acquisition of our customers by other companies and deteriorating general economic conditions. If our customers do not renew their subscriptions for our service or decrease the amount they spend with us, our revenue will decline and our business will suffer.

Our average monthly business service revenue churn was 1.3% for the fiscal year ended March 31, 2014 compared with 1.7% for the fiscal year ended March 31, 2013. Our churn rate could increase in the future if customers are not satisfied with our service. Other factors, including increased competition from other providers of communications and collaborations services, alternative technologies, and adverse business conditions also influence our churn rate.

Because of churn, we must acquire new customers on an ongoing basis to maintain our existing level of customers and revenues. As a result, marketing expenditures are an ongoing requirement of our business. If our churn rate increases, we will have to acquire even more new customers in order to maintain our existing revenues. We incur significant costs to acquire new customers, and those costs are an important factor in determining our net profitability. Therefore, if we are unsuccessful in retaining customers or are required to spend significant amounts to acquire new customers beyond those budgeted, our revenue could decrease and our net income could decrease.

Although the majority of our billing arrangements with customers are prepaid, we regularly monitor the percentage of customers who cease to pay for our services due to closing or downsizing their business. Even though our customer churn rates improved in fiscal 2014, we believe that between 25% and 50% of our total customer churn is related to customers' financial condition and we cannot be certain that we will continue to experience the same improvement in churn rates given current economic conditions. Due to the length of our sales cycle, especially in adding new mid-market and larger distributed enterprises as customers, we may experience delays in acquiring new customers to replace those that have terminated our services. Such delays would be exacerbated if general economic conditions worsen. An increase in churn, particularly in challenging economic times, could have a negative impact on the results of our operations.

The majority of our existing and target customers are in the SMB and mid-market business sectors. These businesses may be more likely to be significantly affected by economic downturns than larger, more established businesses. They also may be more likely to require working capital financing from local and regional banks whose lending activities have been reduced substantially since 2008, as a result of which many of our existing and target customers may lack the funds necessary to add new equipment and services such as ours. Additionally, these customers often have limited discretionary funds which they may choose to spend on items other than our products and services. If small and medium businesses continue to experience economic hardship, this could negatively affect the overall demand for our products and services, delay and lengthen sales cycles and lead to slower growth or even a decline in our revenue, net income and cash flows.

13

The market for cloud communications and collaboration services is subject to rapid technological change, and we depend on new product and service introductions in order to maintain and grow our business.

We operate in an emerging market that is characterized by rapid changes in customer requirements, frequent introductions of new and enhanced products, and continuing and rapid technological advancement. To compete successfully in this emerging market, we must continue to design, develop, manufacture, and sell new and enhanced cloud communications and collaboration products and services that provide higher levels of performance and reliability at lower cost. If we are unable to develop new services that address our customers' needs, to deliver our applications in one seamless integrated product offering that addresses our customers' needs, or to enhance and improve our services in a timely manner, we may not be able to achieve or maintain adequate market acceptance of our services. Our ability to grow is also subject to the risk of future disruptive technologies. Access and use of our services is provided via the cloud, which, itself, has been disruptive to the previous premise-based model. If new technologies emerge that are able to deliver communications and collaboration services at lower prices, more efficiently, more conveniently or more securely, such technologies could adversely impact our ability to compete.

Maintaining adequate research and development personnel and resources is essential to new product development and continued innovation, and we intend to increase our investment in research and development activities to add new features and services to our offerings. If we are unable to develop new features and services internally due to certain constraints, such as high employee turnover, lack of management ability or a lack of other research and development resources, we may miss market opportunities. Further, many of our competitors expend a considerably greater amount of funds on their research and development programs, and those that do not may be acquired by larger companies that would allocate greater resources to our competitors' research and development programs. In addition, there is no guarantee that our research and development efforts will succeed, or that our new products and services will enable us to maintain or grow our revenue or recover our development costs. Our failure to maintain adequate research and development resources, to compete effectively with the research and development programs of our competitors and to successfully monetize our research and development efforts could materially and adversely affect our business and results of operations.

As usage of our communications and collaboration services by mid-market and larger distributed enterprises expands and as customers continue to integrate our services across their enterprises, we will need to devote additional resources to improving our application architecture, integrating our products and applications across our technology platform, integrating with third-party systems, and maintaining infrastructure performance. As our customers gain more experience with our services, the number of users and transactions managed by our services, the amount of data transferred, processed and stored by us, the number of locations where our service is being accessed, and the volume of communications managed by our services have in some cases, and may in the future, expand rapidly. In addition, we will need to appropriately scale our internal business systems and our services organization, including customer support and services, to serve our growing customer base. Any failure of or delay in these efforts could cause impaired system performance and reduced customer satisfaction. These issues could reduce the attractiveness of our cloud communications and collaboration services to customers, resulting in decreased sales to new customers, lower renewal rates by existing customers, the issuance of service credits, or requested refunds, which could hurt our revenue growth and our reputation. Even if we are able to upgrade our systems and expand our staff, any such expansion will be expensive and complex, requiring management time and attention and increasing our operating expenses. We could also face inefficiencies or operational failures as a result of our efforts to scale our infrastructure. Moreover, there are inherent risks associated with upgrading, improving and expanding our information technology systems. We cannot be sure that the expansion and improvements to our infrastructure and systems will be fully or effectively implemented on a timely basis, if at all. These efforts may reduce revenue and our margins and adversely impact our financial results.

We currently use the infrastructure of third-party network service providers, including the services of Equinix, Inc., and Level 3 Communications, Inc., to provide all of our cloud services over their networks rather than deploying our own networks.

We also rely on third-party network service providers to originate and terminate substantially all of the PTSN calls using our cloud-based services. We leverage the infrastructure of third party network service providers to provide telephone numbers, PSTN call termination and origination services, and local number portability for our customers rather than deploying our own network throughout the United States. This decision has resulted in lower capital and operating costs for our business in the short-term, but has reduced our operating flexibility and ability to make timely service changes. If any of these network service providers cease operations or otherwise terminate the services that we depend on, the delay in switching our technology to

14

another network service provider, if available, and qualifying this new service provider could have a material adverse effect on our business, financial condition or operating results. The rates we pay to our network service providers may also increase, which may reduce our profitability and increase the retail price of our service.

While we believe that relations with our current service providers are good, and we have contracts in place, there can be no assurance that these service providers will be able or willing to supply cost-effective services to us in the future or that we will be successful in signing up alternative or additional providers. Although we believe that we could replace our current providers, if necessary, our ability to provide service to our subscribers could be impacted during this any such transition, which could have an adverse effect on our business, financial condition or results of operations. The loss of access to, or requirement to change, the telephone numbers we provide to our customers also could have a material adverse effect on our business, financial condition or operating results.

Due to our reliance on these service providers, when problems occur in a network, it may be difficult to identify the source of the problem. The occurrence of hardware and software errors, whether caused by our service or products or those of another vendor, may result in the delay or loss of market acceptance of our products and any necessary revisions may force us to incur significant expenses. The occurrence of some of these types of problems may seriously harm our business, financial condition or operating results.

Our leased network and data centers are subject to various points of failure. Problems with cooling equipment, generators, uninterruptible power supply, routers, switches, or other equipment, whether or not within our control, could result in service interruptions for our customers as well as equipment damage. Because our services do not require geographic proximity of our data centers to our customers, our infrastructure is consolidated into a few large data center facilities. Any failure or downtime in one of our data center facilities could affect a significant percentage of our customers. The total destruction or severe impairment of any of our data center facilities could result in significant downtime of our services and the loss of customer data. Because our ability to attract and retain customers depends on our ability to provide customers with highly reliable service, even minor interruptions in our service could harm our reputation. Additionally, in connection with the expansion or consolidation of our existing data center facilities from time to time, there is an increased risk that service interruptions may occur as a result of server relocation or other unforeseen construction-related issues.

We have experienced interruptions in service in the past. While we have not experienced a material increase in customer attrition following these events, the harm to our reputation is difficult to assess. We have taken and continue to take steps to improve our infrastructure to prevent service interruptions, including upgrading our electrical and mechanical infrastructure. However, service interruptions continue to be a significant risk for us and could materially impact our business.

Any future service interruptions could:

• cause our customers to seek damages for losses incurred;
• require us to replace existing equipment or add redundant facilities;
• affect our reputation as a reliable provider of hosting services;
• cause existing customers to cancel or elect to not renew their contracts; or
• make it more difficult for us to attract new customers.

Any of these events could materially increase our expenses or reduce our revenue, which would have a material adverse effect on our operating results.

We may also be required to transfer our servers to new data center facilities in the event that we are unable to renew our leases on acceptable terms, or at all, or the owners of the facilities decide to close their facilities, and we may incur significant costs and possible service interruption in connection with doing so. In addition, any financial difficulties, such as bankruptcy or foreclosure, faced by our third-party data center operators, or any of the service providers with which we or they contract, may have negative effects on our business, the nature and extent of which are difficult to predict. Additionally, if our data centers

15

are unable to keep up with our increasing needs for capacity, our ability to grow our business could be materially and adversely impacted.

We rely on third-party vendors for IP phones and software endpoints required to utilize our service. We currently do not have long-term supply contracts with any of these vendors. As a result, most of these third-party vendors are not obligated to provide products or services to us for any specific period, in any specific quantities or at any specific price, except as may be provided in a particular purchase order. The inability of these third-party vendors to deliver IP phones of acceptable quality and in a timely manner, particularly the sole source vendors, could adversely affect our operating results or cause them to fluctuate more than anticipated. Additionally, some of our products may require specialized or high-performance component parts that may not be available in quantities or in time frames that meet our requirements.

Our services also allow our customers to use and manage our cloud communications and collaboration services on smartphones, tablets and other mobile devices. As new smart devices and operating systems are released, we may encounter difficulties supporting these devices and services, and we may need to devote significant resources to the creation, support, and maintenance of our mobile applications. In addition, if we experience difficulties in the future integrating our mobile applications into smartphones, tablets or other mobile devices or if problems arise with our relationships with providers of mobile operating systems, such as those of Apple Inc. or Google Inc., our future growth and our results of operations could suffer.

Our customers use our service to manage important aspects of their businesses, and any errors, defects, disruptions to our service or other performance problems with our service could hurt our reputation and may damage our customers' businesses. Our services and the systems infrastructure underlying our communications and collaboration platform incorporate software that is highly technical and complex. Our software has contained, and may now or in the future contain, undetected errors, bugs, or vulnerabilities. Some errors in our software code may only be discovered after the code has been released. Any errors, bugs, or vulnerabilities discovered in our code after release could result in damage to our reputation, loss of users, loss of revenue, or liability for damages, any of which could adversely affect our business and financial results. We implement bug fixes and upgrades as part of our regularly scheduled system maintenance, which may lead to system downtime. Even if we are able to implement the bug fixes and upgrades in a timely manner, any history of defects, or the loss, damage or inadvertent release of confidential customer data, could cause our reputation to be harmed, and customers may elect not to purchase or renew their agreements with us and subject us to service performance credits, warranty claims or increased insurance costs. The costs associated with any material defects or errors in our software or other performance problems may be substantial and could materially adversely affect our operating results.

Our technology platform incorporates software licensed from third parties, including some software, known as open source software, which we use without charge. Although we monitor our use of open source software, the terms of many open source licenses to which we are subject have not been interpreted by U.S. or foreign courts, and there is a risk that such licenses could

16

be construed in a manner that imposes unanticipated conditions or restrictions on our ability to provide our platform to our customers, content creators and brand advertisers. In the future, we could be required to seek licenses from third parties in order to continue offering our platform, which licenses may not be available on terms that are acceptable to us, or at all. Alternatively, we may need to re-engineer our platform or discontinue use of portions of the functionality provided by our platform. In addition, the terms of open source software licenses may require us to provide software that we develop using such software to others on unfavorable license terms. Our inability to use third party software could result in disruptions to our business, or delays in the development of future offerings or enhancements of existing offerings, which could impair our business.

Our products and services depend on the ability of our users to access the Internet, and certain of our products require significant bandwidth to work effectively. In addition, users who access our services and applications through mobile devices, such as smartphones and tablets, must have a high-speed connection, such as Wi-Fi, 3G, 4G or LTE, to use our services and applications. Currently, this access is provided by companies that have significant and increasing market power in the broadband and Internet access marketplace, including incumbent telephone companies, cable companies and mobile communications companies. Some of these providers offer products and services that directly compete with our own offerings, which give them a significant competitive advantage. Some of these providers have stated that they may take measures that could degrade, disrupt or increase the cost of user access to certain of our products by restricting or prohibiting the use of their infrastructure to support or facilitate our offerings, or by charging increased fees to us or our users to provide our offerings, while others, including some of the largest providers of broadband Internet access services, have committed to not engaging in such behavior. These providers have the ability generally to increase their rates, which may effectively increase the cost to our customers of using our cloud communications and collaboration services.

On January 14, 2014, the United States Court of Appeals for the District of Columbia Circuit vacated and remanded part of the Commission's Open Internet rules.  Subsequently, on May 15, 2014, the Federal Communications Commission or FCC released a Notice of Proposed Rulemaking to consider new rules.  We cannot predict the outcome of this rulemaking or predict whether any new rules will be subject to a legal appeal.  Although we believe interference with access to our products and services is unlikely, broadband Internet access provider interference has occurred in limited circumstances in the United States and could result in a loss of existing users and increased costs, and could impair our ability to attract new users, thereby negatively impacting our revenue and growth.

Our operations depend on our ability to protect our network from interruption by damage from unauthorized entry, computer viruses or other events beyond our control. In the past, we may have been subject to denial or disruption of service, or DDOS, attacks by hackers intent on bringing down our services, and we may be subject to DDOS attacks in the future. We cannot assure you that our backup systems, regular data backups, security protocols, DDOS mitigation and other procedures that are currently in place, or that may be in place in the future, will be adequate to prevent significant damage, system failure or data loss.

Critical to our provision of service is the storage, processing, and transmission of confidential and sensitive data. We store, process and transmit a wide variety of confidential and sensitive information including credit card, bank account and other financial information, proprietary, trade secret or other data that may be protected by intellectual property laws, customers' and employees' personally identifiable information, as well as other sensitive information. We, along with others in the industry, will be subject to cyber threats and security breaches, either by third parties or employees, given the nature of the information we store, process and transmit. Our continued ability to securely store, process and transmit data is essential to our business.

We are aware of the risks associated with cyber threats and we have implemented a number of measures to protect ourselves from cyber attacks. Specifically, we have redundant servers such that if we suffer equipment or software failures in one location or on one set of servers, we have the ability to provide continuity of service. We actively monitor our network for cyber threats and implement protective measures periodically. We conduct vulnerability assessments and penetration testing and engage in remedial action based on such assessments. Depending on the evolving nature of cyber threats and the measures we may have to implement to continue to maintain the security of our networks and data, our profitability may be adversely be impacted or we may have to increase the price of our services that may make our offerings less competitive with other communications providers.

17

But, like all other companies in the marketplace, there is no guarantee that we will not be adversely impacted by cyber attacks. If our employees or third parties obtain unauthorized access to our network, or if our network is penetrated, our service could be disrupted and sensitive information could be lost, stolen or disclosed which could have a variety of negative impacts, including legal liability, investigations by federal and state law enforcement agencies, and exposure to fines or penalties, any of which could harm our business reputation and have a material negative impact on our business. In addition, to the extent we market our services as compliant with particular laws governing data privacy and security, such as HIPAA, a security breach that exposes protected information may make us susceptible to claims of false advertising and unfair trade practices for misrepresenting our level of compliance, in addition to any liability we may have for the breach itself.

Many governments have enacted laws requiring companies to notify individuals of data security incidents involving certain types of personal data. In addition, some of our customers contractually require notification of any data security compromise. Security compromises experienced by our competitors, by our customers or by us may lead to public disclosures, which may lead to widespread negative publicity. Any security compromise in our industry, whether actual or perceived, could harm our reputation, erode customer confidence in the effectiveness of our security measures, negatively impact our ability to attract new customers, cause existing customers to elect not to renew their subscriptions or subject us to third-party lawsuits, regulatory fines or other action or liability, which could materially and adversely affect our business and operating results.

There can be no assurance that any limitations of liability provisions in our contracts for a security breach would be enforceable or adequate or would otherwise protect us from any such liabilities or damages with respect to any particular claim. We also cannot be sure that our existing general liability insurance coverage and coverage for errors or omissions will continue to be available on acceptable terms or will be available in sufficient amounts to cover one or more large claims, or that the insurer will not deny coverage as to any future claim. The successful assertion of one or more large claims against us that exceed available insurance coverage, or the occurrence of changes in our insurance policies, including premium increases or the imposition of large deductible or co-insurance requirements, could have a material adverse effect on our business, financial condition and operating results.

We are subject to the data privacy and protection laws and regulations adopted by federal, state and foreign governmental agencies. Data privacy and protection is highly regulated, and may become the subject of additional regulation in the future. Privacy laws restrict our storage, use, processing, disclosure, transfer and protection of non-public personal information, including credit card data, provided to us by our customers. We strive to comply with all applicable laws, regulations, policies and legal obligations relating to privacy and data protection. However, it is possible that these requirements may be interpreted and applied in a manner that is inconsistent from one jurisdiction to another and may conflict with other rules or our practices. We are also subject to the privacy and data protection-related obligations in our contracts with our customers and other third parties. Any failure, or perceived failure, by us to comply with federal, state, or international laws, including laws and regulations regulating privacy, data or consumer protection, or to comply with our contractual obligations related to privacy, could result in proceedings or actions against us by governmental entities or others, which could result in significant liability to us as well as harm to our reputation.

A fundamental requirement for operating an Internet-based, worldwide communication and collaboration service and electronically billing our customers is the secure transmission of confidential information and media over public networks. Although we have developed systems and processes that are designed to protect consumer information and prevent fraudulent credit card transactions and other security breaches, failure to mitigate such fraud or breaches may adversely affect our operating results. The law relating to the liability of providers of online payment services is currently unsettled and states may enact their own rules with which we may not comply. We rely on third party providers to process and guarantee payments made by our subscribers up to certain limits, and we may be unable to prevent our customers from fraudulently receiving goods and services. Our liability risk will increase if a larger fraction of transactions effected using our cloud-based services involve fraudulent or disputed credit card transactions. Any costs we incur as a result of fraudulent or disputed transactions could harm our business. In addition, the functionality of our current billing system relies on certain third party vendors delivering services. If these vendors are unable or unwilling to provide services, we will not be able to charge for our services in a timely or scalable fashion, which could significantly decrease our revenue and have a material adverse effect on our business, financial condition and operating results.

18

We must maintain Payment Card Industry Data Security Standard, or PCI DSS, compliance to bill our customers via credit card. If we fail to meet minimum-security standards for PCI DSS compliance, credit card providers such as American Express Company or Visa Inc. could refuse to process credit card transactions on our behalf and our ability to collect payments from our customers would be adversely impacted.

We may also experience losses due to subscriber fraud and theft of service. Subscribers have, in the past, obtained access to our service without paying for monthly service and international toll calls by unlawfully using our authorization codes or by submitting fraudulent credit card information. To date, such losses from unauthorized credit card transactions and theft of service have not been significant. We have implemented anti-fraud procedures in order to control losses relating to these practices, but these procedures may not be adequate to effectively limit all of our exposure in the future from fraud. If our procedures are not effective, consumer fraud and theft of service could significantly decrease our revenue and have a material adverse effect on our business, financial condition and operating results. In addition, software and security flaws in our software can result in unauthorized access to our core network resulting in damages such as fraudulent toll usage on our network.

Additionally, third parties have attempted in the past, and may attempt in the future, to fraudulently induce domestic and international employees, consultants or customers into disclosing sensitive information, such as user names, passwords or customer proprietary network information, or CPNI, or other information in order to gain access to our customers' data or to our data. CPNI includes information such as the phone numbers called by a consumer, the frequency, duration, and timing of such calls, and any services/features purchased by the consumer, such as call waiting, call forwarding, and caller ID, in addition to other information that may appear on a consumer's bill.

As a provider of "cloud-based" services, our services rely on uninterrupted connection to the Internet through data centers and networks. Any interruption or disruption to our network, or the third parties on which we rely, could adversely impact our ability to provide service. Our network could be disrupted by circumstances outside of our control including natural disasters, acts of war, terrorist attacks or other malicious acts including, but not limited to, cyber attacks. Our headquarters, global networks operations center and one of our third- party data center facilities are located in the San Francisco Bay Area, a region known for seismic activity. Should any of these events occur and interfere with our ability to operate our network even for a limited period of time, we could incur significant expenses, lose substantial amounts of revenue, suffer damage to our reputation, and lose customers. Such an event may also impede our customers' connections to our network, since these connections also occur over the Internet, and would be perceived by our customers as an interruption of our services, even though such interruption would be beyond our control. Any of these events could have a material adverse impact on our business.

We rely upon certain technology, including hardware and software, licensed from third parties. There can be no assurance that the technology licensed by us will continue to provide competitive features and functionality or that licenses for technology currently utilized by us or other technology which we may seek to license in the future, will be available to us on commercially reasonable terms or at all. The loss of, or inability to maintain, existing licenses could result in delays or reductions in the installation and deployment of our cloud communications and collaboration services until equivalent technology or suitable alternative products could be developed, identified, licensed and integrated, and could harm our business. Software defects in the core IP and networking hardware we license from vendors, over which we have little or no control, can adversely affect our ability to deliver services to our customers and could harm our business. These licenses are on standard commercial terms made generally available by the companies providing the licenses. The cost and terms of these licenses individually are not material to our business.

There has been substantial litigation in the communications, cloud telephony services, semiconductor, electronics, and related industries regarding intellectual property rights and, from time to time, third parties may claim that we, our customers, our licensees or parties' indemnified by us are infringing, misappropriating or otherwise violating their intellectual property rights. Third parties may also claim that our employees have misappropriated or divulged their former employers' trade secrets or confidential information. Our broad range of current and former technology, including IP telephony systems, digital and analog circuits, software, and semiconductors, increases the likelihood that third parties may claim infringement by us of their

19

intellectual property rights. For example, on May 2, 2008, we received a letter from AT&T Intellectual Property, L.L.C., or AT&T IP, expressing the belief that we must license a specified patent for use in our 8x8 broadband telephone service, as well as suggesting that we obtain a license to its portfolio of MPEG-4 patents for use with our video telephone products and services. At the same time, we began an evaluation of whether AT&T IP's affiliated entities may need to license any of our patents or other intellectual property. We have continued to engage in discussions with AT&T IP to explore a mutually agreeable resolution of the parties' respective assertions regarding these intellectual property issues. We are unable at this time to state whether we will enter into any license or cross-license agreements with AT&T IP or whether we ultimately anticipate any material effects on our operating results or financial condition as a consequence of these matters.

Certain technology necessary for us to provide our services may, in fact, be patented by other parties either now or in the future. If such technology were held under patent by another person, we would have to negotiate a license for the use of that technology, which we may not be able to negotiate at a price that is acceptable or at all. The existence of such a patent, or our inability to negotiate a license for any such technology on acceptable terms, could force us to cease using such technology and offering products and services incorporating such technology.

We have recently been named as defendants in four patent infringement lawsuits. On February 22, 2011, we were named a defendant in a lawsuit, Bear Creek Technologies, Inc. v. 8x8, Inc. et al., along with 20 other defendants. On October 25, 2011, we were named a defendant in a lawsuit, Klausner Technologies, Inc. v. Oracle Corporation et al., along with 30 other defendants. On March 31, 2014, we were named a defendant in a lawsuit, CallWave Communications LLC v. 8x8, Inc. On April 23, 2014, we were named but not served as a defendant in a lawsuit, TQP Development LLC v. 8x8, Inc. On April 30, 2014 (and before any service of the complaint), TQP Development filed papers to dismiss this lawsuit and other lawsuits that were filed on or about the same time. If we are found to be infringing on the intellectual property rights of any third party in these lawsuits or other claims and proceedings that may be asserted against us in the future, we could be subject to monetary liabilities for such infringement, which could be material. We could also be required to refrain from using, manufacturing or selling certain products or using certain processes, either of which could have a material adverse effect on our business and operating results. From time to time, we have received, and may continue to receive in the future, notices of claims of infringement, misappropriation or misuse of other parties' proprietary rights. There can be no assurance that we will prevail in these discussions and actions or that other actions alleging infringement by us of third party patents will not be asserted or prosecuted against us. Furthermore, lawsuits like these may require significant time and expense to defend, may divert management's attention away from other aspects of our operations and, upon resolution, may have a material adverse effect on our business, results of operations, financial condition and cash flows. More information regarding the four pending suits is provided under Part I, Item 3 of our Annual Report on Form 10-K for the fiscal year ended March 31, 2014.

We rely, in part, on trademark, copyright, and trade secret law to protect our intellectual property in the United States and abroad. We seek to protect our software, documentation, and other written materials under trade secret and copyright law, which afford only limited protection. We also rely, in part, on patent law to protect our intellectual property in the United States and internationally. As of March 31, 2014, we had been awarded 92 United States patents, more than 60 of which we currently hold and which we expect to expire between 2014 and 2032. We have additional United States and foreign patents pending. We cannot predict whether such pending patent applications will result in issued patents, and if they do, whether such patents will effectively protect our intellectual property. The intellectual property rights we obtain may not be sufficient to provide us with a competitive advantage, and could be challenged, invalidated, infringed or misappropriated. We may not be able to protect our proprietary rights in the United States or internationally (where effective intellectual property protection may be unavailable or limited), and competitors may independently develop technologies that are similar or superior to our technology, duplicate our technology or design around any patent of ours.

We attempt to further protect our proprietary technology and content by requiring our employees and consultants to enter into confidentiality and assignment of inventions agreements and third parties to enter into nondisclosure agreements. These agreements may not effectively prevent unauthorized use or disclosure of our confidential information, intellectual property or technology and may not provide an adequate remedy in the event of unauthorized use or disclosure of our confidential information, intellectual property or technology.

Litigation may be necessary in the future to enforce our intellectual property rights, to determine the validity and scope of our proprietary rights or the rights of others, or to defend against claims of infringement or invalidity. Such litigation could result in substantial costs and diversion of management time and resources and could have a material adverse effect on our business, financial condition, and operating results. Any settlement or adverse determination in such litigation would also subject us to significant liability.

20

We may also be required to protect our proprietary technology and content in an increasing number of jurisdictions, a process that is expensive and may not be successful, or which we may not pursue in every location. In addition, effective intellectual property protection may not be available to us in every country, and the laws of some foreign countries may not be as protective of intellectual property rights as those in the United States. Additional uncertainty may result from changes to intellectual property legislation enacted in the United States and elsewhere, and from interpretations of intellectual property laws by applicable courts and agencies. Accordingly, despite our efforts, we may be unable to obtain and maintain the intellectual property rights necessary to provide us with a competitive advantage.

On November 29, 2013, we acquired Voicenet Solutions Limited ("Voicenet"), a UK-based provider of cloud communications and collaboration services in the United Kingdom. In fiscal 2012, we completed two acquisitions of businesses. In fiscal 2011, we completed one acquisition and one investment in another company. If appropriate opportunities present themselves, we may make additional acquisitions or investments or enter into joint ventures or strategic alliances with other companies. Risks commonly encountered in such transactions include:

• the difficulty of assimilating the operations and personnel of the combined companies;
• the risk that we may not be able to integrate the acquired services or technologies with our current services, products, and technologies;
• the potential disruption of our ongoing business;
• the diversion of management attention from our existing business;
• the inability of management to maximize our financial and strategic position through the successful integration of the acquired businesses;
• difficulty in maintaining controls, procedures, and policies;
• the impairment of relationships with employees, suppliers, and customers as a result of any integration;
• the loss of an acquired base of customers and accompanying revenue;
• the assumption of leased facilities, other long-term commitments or liabilities that could have a material adverse impact on our profitability and cash flow; and
• the dilution to our existing stockholders from the issuance of additional shares of common stock or reduction of earnings per outstanding share in connection with an acquisition that fails to increase the value of our company.

As a result of these potential problems and risks, among others, businesses that we may acquire or invest in may not produce the revenue, earnings, or business synergies that we anticipate. In addition, there can be no assurance that any potential transaction will be successfully completed or that, if completed, the acquired business or investment will generate sufficient revenue to offset the associated costs or other potential harmful effects on our business.

Our historical operating results have fluctuated significantly and will likely continue to fluctuate in the future, and a decline in our operating results could cause our stock price to fall. On an annual and a quarterly basis, there are a number of factors that may affect our operating results, many of which are outside our control. These include, but are not limited to:

• changes in market demand;
• the timing of customer subscriptions for our cloud communications and collaboration services;
• customer cancellations;

21

• changes in the competitive dynamics of our market, including consolidation among competitors or customers;
• lengthy sales cycles and/or regulatory approval cycles;
• new product introductions by us or our competitors;
• market acceptance of new or existing services and features;
• the mix of our customer base and sales channels;
• the mix of services sold;
• the number of additional customers, on a net basis;
• the amount and timing of costs associated with recruiting, training and integrating new employees;
• unforeseen costs and expenses related to the expansion of our business, operations and infrastructure;
• continued compliance with industry standards and regulatory requirements;
• introduction and adoption of our cloud communications and collaboration services in markets outside of the United States; and
• general economic conditions.

Due to these and other factors, we believe that period-to-period comparisons of our results of operations are not meaningful and should not be relied upon as indicators of our future performance. It is possible that in some future periods our results of operations may be below the expectations of public market analysts and investors. If this were to occur, the price of our common stock would likely decline significantly.

In addition to reliability and quality standards, the market acceptance of telephony over broadband IP networks is dependent upon the adoption of industry standards so that products from multiple manufacturers are able to communicate with each other. Our cloud-based communications and collaboration services rely heavily on communication standards such as SIP, MGCP and network standards such as TCP/IP and UDP to interoperate with other vendors' equipment. There is currently a lack of agreement among industry leaders about which standard should be used for a particular application, and about the definition of the standards themselves. These standards, as well as audio and video compression standards, continue to evolve. We also must comply with certain rules and regulations of the FCC regarding electromagnetic radiation and safety standards established by Underwriters Laboratories, as well as similar regulations and standards applicable in other countries. Standards are frequently modified or replaced. As standards evolve, we may be required to modify our existing products or develop and support new versions of our products. We must comply with certain federal, state and local requirements regarding how we interact with our customers, including marketing practices, consumer protection, privacy, and billing issues, the provision of 9-1-1 emergency service and the quality of service we provide to our customers. The failure of our products and services to comply, or delays in compliance, with various existing and evolving standards could delay or interrupt volume production of our communications and collaboration services, subject us to fines or other imposed penalties, or harm the perception and adoption rates of our service, any of which would have a material adverse effect on our business, financial condition or operating results.

For example:

• The FCC has implemented network neutrality rules in the past and is considering new rulemaking proceedings regarding network neutrality. In December 2010, the FCC adopted new net neutrality rules that would protect services like ours from such interference. Several parties sought judicial review of the FCC's net neutrality rules, and in January 2014 the anti-blocking and unreasonable discrimination provisions of the rules were vacated. While the court ruling did not foreclose the FCC from adopting anti-blocking or non-discrimination rules, interference with our service or higher charges for using our service could cause us to lose existing customers, impair our ability to attract new customers, and harm our revenue and growth. These problems could also arise in international markets. Most foreign countries have not adopted formal net neutrality rules like those adopted by the FCC.

22

• Reform of federal and state Universal Service Fund programs could increase the cost of our service to our customers diminishing or eliminating our pricing advantage. The FCC and a number of states are considering reform or other modifications to Universal Service Fund programs. Should the FCC or certain states adopt new contribution mechanisms or otherwise modify contribution obligations that increase our contribution burden, we will either need to raise the amount we currently collect from our customers to cover this obligation or absorb the costs, which would reduce our profit margins. Furthermore, the FCC has ruled that states can require us to contribute to state Universal Service Fund programs. A number of states already require us to contribute, while others are actively considering extending their programs to include the services we provide. We currently pass-through Universal Service Fund contributions to our customers, which may result in our services becoming less competitive as compared to those provided by others.
• We may become subject to state regulation for certain service offerings. Certain states take the position that offerings by VoIP providers, like us, are intrastate and therefore subject to state regulation. These states argue that if the beginning and end points of communications are known, and if some of these communications occur entirely within the boundaries of a state, the state can regulate that offering. We believe that the FCC has preempted states from regulating VoIP services like ours in the same manner as providers of traditional telecommunications services. We cannot predict how this issue will be resolved or its impact on our business at this time.
• The FCC and Congress are investigating call completion rates to rural areas of the United States. It is possible that we, like other providers in the communications marketplace, may be subject to fines or other enforcement actions should the FCC determine that our call completion rates to rural areas are, or have been, unacceptable.
• The FCC may require providers like us to comply with regulations related to how we present bills to customers. The adoption of such obligations may require us to revise our bills and may increase our costs of providing service which could either result in price increases or reduce our profitability.
• The FCC adopted rules concerning disabilities access requirements that may expand disabilities access requirements to additional services we offer. We cannot predict whether we will be subject to additional accessibility requirements or whether any of our service offerings that are not currently subject to disabilities access requirements will be subject to such obligations.
• There may be risks associated with our ability to comply with requirements of the Telecommunications Relay Service. The FCC requires providers of interconnected VoIP services to comply with certain regulations pertaining to people with disabilities and to contribute to the Telecommunications Relay Services fund. We are also required to offer 7-1-1 abbreviated dialing for access to relay services.
• There may be risks associated with our ability to comply with the requirements of federal law enforcement agencies. The FCC requires all interconnected VoIP providers to comply with the Communications Assistance for Law Enforcement Act, or CALEA. The FCC allows VoIP providers to comply with CALEA through the use of a service provided by a trusted third party with the ability to extract call content and call-identifying information from a VoIP provider's network.
• The FCC may require us to deploy an E-911 service that automatically determines the location of our customers. On June 1, 2007, the FCC released a Notice of Proposed Rulemaking, or the VoIP E-911 order, in which it tentatively concluded that all interconnected VoIP providers that allow customers to use their service in more than one location (nomadic VoIP service providers, such as us), must utilize an automatic location technology that meets the same accuracy standards which apply to providers of commercial mobile radio services (mobile phone service providers) Since then, the FCC has been conducting proceedings and inquiries concerning the implementation of such a rule. The outcome of these proceedings cannot be determined at this time and we may or may not be able to comply with any such obligations that may be adopted. At present, we currently have no means to automatically identify the physical location of one of our customers on the Internet. We cannot guarantee that emergency calling service consistent with the VoIP E-911 order will be available to all of our customers, especially those accessing our services from outside of the United States. The FCC's current VoIP E-911 order or follow-on orders or clarifications or their impact on our customers due to service price increases or other factors could have a material adverse effect on our business, financial condition or operating results.

23

• The FCC adopted orders reforming the system of payments between regulated carriers that we partner with to interface with the public switch telephone network. The FCC reformed the system under which regulated providers of telecommunications services compensate each other for various types of traffic, including VoIP traffic that terminates on the PSTN and applied new call signaling requirements to VoIP providers and other service providers. The FCC's new rules require, among other things, interconnected VoIP providers, like us, that originate interstate or intrastate traffic destined for the PSTN, to transmit the telephone number associated with the calling party to the next provider in the call path. Intermediate providers must pass calling party number or charge number signaling information they receive from other providers unaltered, to subsequent providers in the call path. While we believe we are in compliance with this rule, to the extent that we pass traffic that does not have appropriate calling party number or charge number information, we could be subject to fines, cease and desist orders, or other penalties. The FCC's Order reforming payments between carriers for various types of traffic also includes a Further Notice of Proposed Rulemaking. Depending on the rules adopted by the FCC in this proceeding, the payments we make to underlying carriers to access the PSTN may increase, which may result in us increasing the retail price of our service, potentially making our offering less competitive with traditional providers of telecommunications services, or may reduce our profitability.

Both our emergency calling service and our E-911 calling service are different, in significant respects, from the emergency calling services offered by traditional wireline telephone companies. In each case, the differences may cause significant delays, or even failures, in callers' receipt of the emergency assistance they need.

The FCC may determine that our nomadic emergency calling service does not satisfy the requirements of its VoIP E-911 order because, in some instances, our nomadic emergency calling service requires that we route an emergency call to a national emergency call center instead of connecting our customers directly to a local public-safety answering point through a dedicated connection and through the appropriate selective router.

Delays our customers may encounter when making emergency services calls and any inability of the answering point to automatically recognize the caller's location or telephone number can result in life threatening consequences. Customers may, in the future, attempt to hold us responsible for any loss, damage, personal injury or death suffered as a result of any failure of our E-911 services. In July 2008, the President signed into law the New and Emerging Technologies 911 Improvement Act of 2008. The law provides public safety entities, interconnected VoIP providers and others involved in handling 911 calls the same liability protections when handling 911 calls from interconnected VoIP users as from mobile or wired telephone service users. The applicability of the liability protections to our national call center service is unclear at the present time. Also, we may be exposed to liability for 911 calls made prior to the adoption of this new law although we are unaware of any such liability.

Our data centers are susceptible to increased costs of power and to electrical power outages. Our customer contracts do not contain provisions that would allow us to pass on any increased costs of energy to our customers, which could affect our operating margins. Any increases in the price of our services to recoup these costs could not be implemented until the end of a customer contract term. Further, power requirements at our data centers are increasing as a result of the increasing power demands of today's servers. Increases in our power costs could impact our operating results and financial condition. Since we rely on third parties to provide our data centers with power sufficient to meet our needs, our data centers could have a limited or inadequate amount of electrical resources necessary to meet our customer requirements. We attempt to limit exposure to system downtime due to power outages by using backup generators and power supplies. However, these protections may not limit our exposure to power shortages or outages entirely. Any system downtime resulting from insufficient power resources or power outages could damage our reputation and lead us to lose current and potential customers, which would harm our operating results and financial condition.

24

Decreasing telecommunications rates and increasing regulatory charges may diminish or eliminate our competitive pricing advantage versus legacy providers.

Decreasing telecommunications rates may diminish or eliminate the competitive pricing advantage of our services, while increased regulation and the imposition of additional regulatory funding obligations at the federal, state and local level could require us to either increase the retail price for our services, thus making us less competitive, or absorb such costs, thus decreasing our profit margins. International and domestic telecommunications rates have decreased significantly over the last few years in most of the markets in which we operate, and we anticipate these rates will continue to decline in all of the markets in which we do business or expect to do business. Users who select our services to take advantage of the current pricing differential between traditional telecommunications rates and our rates may switch to traditional telecommunications carriers if such pricing differentials diminish or disappear, however, and we will be unable to use such pricing differentials to attract new customers in the future. Continued rate decreases would require us to lower our rates to remain competitive and would reduce or possibly eliminate any gross profit from our services. In addition, we may lose subscribers for our services.

A component of our growth strategy involves the further expansion of our operations and customer base internationally. In November 2013, we acquired Voicenet, demonstrating our commitment to expand our business outside of North America. The risks and challenges associated with sales of our cloud communications and collaboration services to customers outside North America are different in some ways from those associated with sales in North America, and we have a limited history addressing those risks and meeting those challenges. Our current international operations and future initiatives will involve a variety of risks, including:

• localization of our service, including translation into foreign languages and associated expenses;
• changes in a specific country's or region's political or economic conditions;
• unexpected changes in regulatory requirements, taxes or trade laws;
• more stringent regulations relating to data security and the unauthorized use of, or access to, commercial and personal information, particularly in the European Union;
• differing labor regulations, especially in the European Union, where labor laws are generally more advantageous to employees as compared to the United States, including deemed hourly wage and overtime regulations in these locations;
• challenges inherent in efficiently managing an increased number of employees over large geographic distances, including the need to implement appropriate systems, policies, benefits and compliance programs;
• difficulties in managing a business in new markets with diverse cultures, languages, customs, legal systems, alternative dispute systems and regulatory systems;
• increased travel, real estate, infrastructure and legal compliance costs associated with international operations;
• different pricing environments, longer sales cycles, longer accounts receivable payment cycles and other collection difficulties;
• currency exchange rate fluctuations and the resulting effect on our revenue and expenses, and the cost and risk of entering into hedging transactions if we chose to do so in the future;
• limitations on our ability to reinvest earnings from operations in one country to fund the capital needs of our operations in other countries;
• laws and business practices favoring local competitors or general preferences for local vendors;
• limited or insufficient intellectual property protection;

25

• political instability or terrorist activities;
• exposure to liabilities under anti-corruption and anti-money laundering laws, including the U.S. Foreign Corrupt Practices Act and similar laws and regulations in other jurisdictions; and
• adverse tax burdens and foreign exchange controls that could make it difficult to repatriate earnings and cash.

We have limited experience in operating our business internationally, which increases the risk that any potential future expansion efforts that we may undertake will not be successful. If we invest substantial time and resources to expand our international operations and are unable to do so successfully and in a timely manner, our business and operating results will suffer.

Regulatory treatment of VoIP telephony and cloud-based services outside the United States varies from country to country and often the laws are unclear. In January 2013, we launched our Virtual Office services in Canada. We currently distribute our products and services directly to consumers and through resellers that may be subject to telecommunications regulations in their home countries. The failure by us or our customers and resellers to comply with these laws and regulations could reduce our revenue and profitability. Because of our relationship with the resellers, some countries may assert that we are required to register as a telecommunications provider in that country. In such case, our failure to do so could subject us to fines or penalties. In addition, some countries are considering subjecting VoIP services to the regulations applied to traditional telephone companies. Regulatory developments such as these could have a material adverse effect on the use of our services in international locations.

As we expand our operations internationally, we expect to become subject to additional government regulations. Such regulations include, but are not limited to: licensing obligations, emergency services obligations, data retention and transfer laws and regulations, privacy laws and regulations, consumer protection, national security laws and regulations, law enforcement obligations, financial reporting, surcharge and other fees that must be collected and remitted as well as other laws and regulations. For example, as a provider of electronic communications services in the UK, we are subject to regulation in the UK by the Office of Communications. Some of these regulatory obligations include providing access to emergency call services (E999/112); providing access to operator assistance, directories and directory enquiry services, offering contracts with minimum terms, providing and publishing certain information transparently, providing itemized billing, protecting customer information (including personal data); porting phone numbers upon a valid customer request and implementing a code of practice. We are also required to comply with laws and matters relating to, among other things, competition law, distance selling, e-commerce and consumer protection. We must also comply with various reporting and recordkeeping requirements.

In some cases, the relevant laws may be uncertain or unsettled complicating our ability to comply and may subject us to fines, penalties or other enforcement actions. It is possible that we could be subject to civil and criminal liabilities that may damage our business reputation and brand. Moreover, any changes in laws, regulations or enforcement policies may expose us to unknown civil and criminal risks that could requires us to modify our offerings or expose us to fines, penalties or other enforcement actions, or compel us to require with onerous obligations that we either were not previously subject or did not foresee. We may be required to exit certain foreign markets should such changes make the provision of our service unprofitable, too costly, too risky or for other reasons that could adversely impact our profitability, or our ability to compete effectively with other service providers. Any of these occurrences could negatively impact our brand and our business reputation.

We will also become subject to risks associated with changes in the regulatory structure of the telecommunications services marketplace in international markets. As in the United States, we will continue to depend on underlying carriers to terminate our traffic to the PSTN in each country where we offer services. As countries evaluate and change intercarrier payment schemes, remove and impose new obligations, our costs to provide service may increase. This could require us either to reduce our profitability or raise the price of our service which may make our offerings less competitive with other providers in the marketplace. We may have to exit markets that we previously thought would be profitable which could negatively impact our business, and damage our brand and reputation.

We support local number portability, or LNP, which allows our customers to retain their existing telephone numbers when subscribing to our services. A new customer of our services must maintain both the new 8x8 service and the customer's existing telephone service during the number transfer process. By comparison, transferring wireless telephone numbers among wireless service providers generally takes several hours, and transferring wireline telephone numbers among traditional

26

wireline service providers generally takes a few days. In foreign countries, we anticipate longer delays in porting existing telephone numbers. The additional delay that we experience is due to our reliance on third party carriers to transfer the numbers, as well as the delay the existing telephone service provider may contribute to the process. Local number portability is considered an important feature by many potential customers, especially our business customers, and if we fail to reduce related delays, we may experience increased difficulty in acquiring new customers or retaining existing customers.

The development and marketing of our communications and collaboration services will continue to place a significant strain on our limited personnel, management, and other resources. Our future success depends upon the continued services of our executive officers and other key employees who have critical industry experience and relationships that we rely on to implement our business plan. None of our officers or key employees are bound by employment agreements for any specific term. The loss of the services of any of our officers or key employees could delay the development and introduction of, and negatively impact our ability to sell our services which could adversely affect our financial results and impair our growth. We currently do not maintain key person life insurance policies on any of our employees.

As of March 31, 2014, we had cash and cash equivalents and investments of approximately $178.4 million. While we believe these funds are sufficient to meet our current and anticipated liquidity requirements, we may need to raise additional capital to pursue our strategic objectives. We may seek additional funding through public or private equity or debt financing, including pursuant to the shelf registration statement of which this prospectus supplement is a part. We might decide to raise additional debt or equity capital at such times and upon such terms as management considers favorable and in our interests, but we cannot be certain that we will be able to complete offerings of our securities at such times and on such terms as we may consider desirable for us. Any such financings may be upon terms that are dilutive to existing stockholders. We may not be able to obtain such additional financing as needed on acceptable terms, or at all, which may require us to reduce our operating costs and other expenditures, including reductions of personnel and capital expenditures.

Certain provisions in our charter documents and Delaware law could discourage takeover attempts and lead to management entrenchment.

Our restated certificate of incorporation and amended and restated bylaws contain provisions that could have the effect of delaying or preventing changes in control or changes in our management without the consent of our board of directors, including, among other things:

• no cumulative voting in the election of directors, which limits the ability of minority stockholders to elect director candidates;
• the ability of our board of directors to issue shares of preferred stock and to determine the price and other terms of those shares, including preferences and voting rights, without stockholder approval, which could be used to significantly dilute the ownership of a hostile acquirer;
• the exclusive right of our board of directors to elect a director to fill a vacancy created by the expansion of our board of directors or the resignation, death or removal of a director, which prevents stockholders from being able to fill vacancies on our board of directors;
• a prohibition on stockholder action by written consent, which forces stockholder action to be taken at an annual or special meeting of our stockholders;
• the requirement that a special meeting of stockholders may be called only by a majority vote of our Board of Directors, the Chairman of our Board of Directors, our Chief Executive Officer or by stockholders holdings shares of our common stock representing in the aggregate a majority of votes then outstanding, which could delay the ability of our stockholders to force consideration of a proposal or to take action, including the removal of directors;
• the ability of our board of directors, by majority vote, to amend our amended and restated bylaws, which may allow our board of directors to take additional actions to prevent a hostile acquisition and inhibit the ability of an acquirer to amend our amended and restated bylaws to facilitate a hostile acquisition; and

27

• advance notice procedures with which stockholders must comply to nominate candidates to our board of directors or to propose matters to be acted upon at a stockholders' meeting, which may discourage or deter a potential acquirer from conducting a solicitation of proxies to elect the acquirer's own slate of directors or otherwise attempting to obtain control of us.
• We are also subject to certain anti-takeover provisions under the General Corporation Law of the State of Delaware, or the DGCL. Under Section 203 of the DGCL, a corporation may not, in general, engage in a business combination with any holder of 15% or more of its capital stock unless the holder has held the stock for three years or (i) our board of directors approves the transaction prior to the stockholder acquiring the 15% ownership position, (ii) upon consummation of the transaction that resulted in the stockholder acquiring the 15% ownership position, the stockholder owns at least 85% of the outstanding voting stock (excluding shares owned by directors or officers and shares owned by certain employee stock plans) or (iii) the transaction is approved by the board of directors and by the stockholders at an annual or special meeting by a vote of 66 2/3% of the outstanding voting stock (excluding shares held or controlled by the interested stockholder). These provisions in our restated certificate of incorporation and amended and restated bylaws and under Delaware law could discourage potential takeover attempts.

None.

Our principal operations are located in San Jose, CA in a facility that is approximately 104,657 square feet of leased office space. Outside the United States our operations are conducted primarily in leased sites located in the United Kingdom. We believe our facilities will adequately meet our current and foreseeable future needs. For additional information regarding our obligations under leases see Note 4 to the consolidated financial statements contained in Part II, Item 8 of this Report.

From time to time, we become involved in various legal claims and litigation that arise in the normal course of our operations. While the results of such claims and litigation cannot be predicted with certainty, we are not currently aware of any such matters that we believe would have a material adverse effect on our financial position, results of operations or cash flows.

On February 22, 2011, we were named a defendant in a lawsuit, Bear Creek Technologies, Inc. v. 8x8, Inc. et al., along with 20 other defendants. On August 17, 2011, we were dismissed without prejudice from this lawsuit under Rule 21 of the Federal Rules of Civil Procedure. On August 17, 2011, we were sued again by Bear Creek Technologies, Inc. in the United States District Court for the District of Delaware. We believe we have factual and legal defenses to these claims and are presenting a vigorous defense.  Further, on November 28, 2012, the U.S. Patent & Trademark Office initiated a Reexamination proceeding with a Reexamination Declaration explaining that there is a substantial new question of patentability, based on four separate grounds and affecting each claim of the patent which is the basis for the complaint filed against us.  On March 26, 2013, the USPTO issued a first Office Action in the Reexamination, with all claims of the '722 patent being rejected on each of the four separate grounds raised in the Request for Reexamination.  On July 10, 2013, we filed an informational pleading in support of and joining a motion to stay the proceeding in the District Court; the District Court granted the motion on July 17, 2013, based on the possibility that at least one of the USPTO rejections will be upheld and considering the USPTO's conclusion that Bear Creek's patent suffers from a defective claim for priority.  On March 24, 2014, the USPTO issued another Office Action in which the rejections of the claims are maintained.  We cannot estimate potential liability in this case at this early stage of litigation.

On October 25, 2011, we were named a defendant in a lawsuit, Klausner Technologies, Inc. v. Oracle Corporation et al., along with 30 other defendants. The lawsuit alleges infringement of a patent that is now believed to have expired. On November 1, 2011, Klausner dismissed the Complaint voluntarily and filed new complaints separating the defendants, including a new Complaint against 8x8. We believe we have factual and legal defenses to these claims and are presenting a vigorous defense.  On March 21, 2013, the District Court granted 8x8's Motion to Change Venue, and has ordered the transfer of the case to the US District Court for the Northern District of California. An answer to the complaint was filed on April 25, 2014.  We cannot estimate potential liability in this case at this early stage of the litigation.

28

On March 31, 2014, we were named a defendant in a lawsuit, CallWave Communications LLC v. 8x8, Inc.  CallWave Communications also sued Fonality Inc. on March 31, 2014, and previously sued other companies including Verizon, Google, T-Mobile, and AT&T.  We are currently assessing factual and legal defenses to these claims and expect to present a vigorous defense.  We have not answered the complaint yet and cannot estimate potential liability in this case at this early stage of the litigation.

On April 23, 2014, we were named but not served as a defendant in a lawsuit, TQP Development, LLC v. 8x8, Inc. On April 30, 2014 (and before any service of the complaint), TQP Development filed papers to dismiss this lawsuit and other lawsuits that were filed on or about the same time.

Not applicable.

We completed our initial public offering on July 2, 1997 under the name 8x8, Inc. From that date through April 3, 2000, our common stock was traded on the NASDAQ National Market, or the NASDAQ, under the symbol "EGHT." From April 4, 2000 through July 18, 2001, our common stock was traded on the NASDAQ under the symbol "NTRG." Since July 19, 2001 our common stock has traded under the symbol "EGHT." In July 2002, in connection with the transformation of the NASDAQ to a national securities exchange our listing was transferred to the NASDAQ Capital Market of the NASDAQ Stock Market LLC.

We have never paid cash dividends on our common stock and have no plans to do so in the foreseeable future. As of May 15, 2014, there were 251 holders of record of our common stock.

The following table sets forth the range of high and low close prices for each period indicated:

See Item 12 of Part III of this Report regarding information about securities authorized for issuance under our equity compensation plans.

29

The graph below shows the cumulative total stockholder return over a five year period assuming the investment of $100 on March 31, 2009 in each of 8x8's common stock, the NASDAQ Composite Index and the NASDAQ Telecommunications Index. The graph is furnished, not filed, and the historical return cannot be indicative of future performance.

30

ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

We are a leading provider of UCC services in the cloud for SMBs and mid-market and distributed enterprises. We deliver a broad suite of UCC services to in-office and mobile devices spanning cloud telephony, virtual contact center and virtual meeting through our proprietary unified SaaS platform. We currently serve approximately 38,000 business customers with over 500,000 subscriptions, making us a leading provider of UCC services in the cloud. Our software abstracts complex networking, redundancy, security and interconnection requirements to provide a seamless and easy-to-use solution for our customers. Our software also integrates with leading ERP, CRM, HCM and other third-party application suites, such as Salesforce.com and NetSuite, to provide organizations an integrated, fully functional business communications and collaboration experience that is critical to operate their businesses.

In fiscal year 2014, we displayed continued momentum in four areas. First, we saw an increase in the number of new services added during the year, representing a year-over-year increase of 26%, reflecting demand for our services in our domestic small and medium businesses, or SMBs, and mid-market and distributed enterprise customer market. We intend to continue to pursue opportunities to sell our comprehensive suite of services to SMBs and mid-market and distributed enterprises who wish to consolidate their cloud communications and collaborative service requirements with a single service provider.

Second, our continued focus on mid-market and distributed enterprise customers resulted in 34% of our new monthly recurring revenue sold in the fiscal year coming from this the mid-market and channel sales teams that target these customers compared with 25% in fiscal 2013. We continued to show an increase in our average monthly service revenue per customer to $287 in the fourth quarter of fiscal 2014 compared to $256 in the same period of fiscal 2013 which is the result of our success in selling to larger, more established customers.

Third, we continued to focus on selling a greater number of services to our existing customer base. Our comprehensive suite of services, combined with our highly scalable service architecture enables our customers to quickly and easily deploy additional 8x8 products and services to distributed locations and remote employees.

Fourth, we continued to build on our Global Reach initiative by acquiring Voicenet in the United Kingdom in November 2013. In addition, we installed our services infrastructure in a new Hong Kong data center in January 2014. We are in the process of migrating services for non-US customers to our new overseas infrastructure. Beyond serving the needs of existing customers, it is our intent to penetrate these markets through a variety of additional methods including strategic alliances, partners and acquisitions.

To support these initiatives and strengthen our business, we intend to continue investing in research and development and sales and marketing at rates comparable to the third and fourth quarters of fiscal 2014 for the foreseeable future.

Our consolidated financial statements are prepared in conformity with accounting principles generally accepted in the United States of America. Note 1 to the consolidated financial statements in Part II, Item 8 of this Report describes the significant accounting policies and methods used in the preparation of our consolidated financial statements.

We have identified the policies below as some of the more critical to our business and the understanding of our results of operations. These policies may involve a higher degree of judgment and complexity in their application and represent the critical accounting policies used in the preparation of our consolidated financial statements. Although we believe our judgments and estimates are appropriate, actual future results may differ from our estimates. If different assumptions or conditions were to prevail, the results could be materially different from our reported results. The impact and any associated risks related to these policies on our business operations is discussed throughout Management's Discussion and Analysis of Financial Condition and Results of Operations where such policies affect our reported and expected financial results.

31

Use of Estimates

The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities and equity and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, we evaluate our estimates, including, but not limited to, those related to bad debts, valuation of inventories, and litigation and other contingencies. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results could differ from those estimates under different assumptions or conditions. We base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets, liabilities and equity that are not readily apparent from other sources. Actual results could differ from those estimates under different assumptions or conditions. Additional information regarding risk factors that may impact our estimates is included above under Part I, Item 1A, "Risk Factors."

Our revenue recognition policies are described in Note 1 to the consolidated financial statements in Part II, Item 8 of this Report. As described below, significant management judgments and estimates must be made and used in connection with the revenue recognized in any accounting period. Material differences may result in the amount and timing of our revenue for any period if our management made different judgments or utilized different estimates.

We recognize revenue from product sales for which there are no related services to be rendered upon shipment to customers provided that persuasive evidence of an arrangement exists, the price is fixed, title has transferred, collection of resulting receivables is reasonably assured, there are no customer acceptance requirements, and there are no remaining significant obligations. Gross outbound shipping and handling charges are recorded as revenue, and the related costs are included in cost of goods sold. Reserves for returns and allowances for customer sales are recorded at the time of shipment. In accordance with the Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") 985-605, we record shipments to distributors, retailers, and resellers, where the right of return exists, as deferred revenue. We defer recognition of revenue on product sales to distributors, retailers, and resellers until the products have been sold to the end customer.

We record revenue net of any sales-related taxes that are billed to its customers. We believe this approach results in consolidated financial statements that are more easily understood by users.

Under the terms of our typical subscription agreement, new customers can terminate their service within 30 days of order placement and receive a full refund of fees previously paid. We have determined that we have sufficient history of subscriber conduct to make a reasonable estimate of cancellations within the 30-day trial period. Therefore, we recognize new subscriber revenue in the month in which the new order was shipped, net of an allowance for expected cancellations.

ASC 605-25 requires that revenue arrangements with multiple deliverables be divided into separate units of accounting if the deliverables in the arrangement meet specific criteria.  The provisioning of the 8x8 cloud service with the accompanying 8x8 IP telephone constitutes a revenue arrangement with multiple deliverables.  For arrangements with multiple deliverables, we allocate the arrangement consideration to all units of accounting based on their relative selling prices. In such circumstances, the accounting principles establish a hierarchy to determine the relative selling price to be used for allocating arrangement consideration to units of accounting as follows: (i) vendor-specific objective evidence of fair value ("VSOE"), (ii) third-party evidence of selling price ("TPE"), and (iii) best estimate of the selling price ("BESP").

VSOE generally exists only when we sell the deliverable separately, on more than a limited basis, at prices within a relatively narrow range.  When VSOE cannot be established, we attempt to establish the selling price of deliverables based on relevant TPE. TPE is determined based on manufacturer's prices for similar deliverables when sold separately, when possible. When we are unable to establish selling price using VSOE or TPE, we use BESP for the allocation of arrangement consideration. The objective of BESP is to determine the price at which we would transact a sale if the product or service was sold on a stand-alone basis. BESP is generally used for offerings that are not typically sold on a stand-alone basis or for new or highly

32

customized offerings. We determine BESP for a product or service by considering multiple factors including, but not limited to:

• the price list established by its management which is typically based on general pricing practices and targeted gross margin of products and services sold; and

• analysis of pricing history of new arrangements, including multiple element and stand-alone transactions.

In accordance with the guidance of ASC 605-25, when we enter into revenue arrangements with multiple deliverables we allocate arrangement consideration, including activation fees, among the 8x8 IP telephones and subscriber services based on their relative selling prices. Arrangement consideration allocated to the IP telephones that is fixed or determinable and that is not contingent on future performance or future deliverables is recognized as product revenues during the period of the sale less the allowance for estimated returns during the 30-day trial period. Arrangement consideration allocated to subscriber services that is fixed or determinable and that is not contingent on future performance or future deliverables is recognized ratably as service revenues as the related services are provided, which is generally over the initial contract term.

Our ability to enter into revenue generating transactions and recognize revenue in the future is subject to a number of business and economic risks discussed above under Item 1A,"Risk Factors."

We must make estimates of the collectability of our accounts receivable. Management specifically analyzes accounts receivable, including historical bad debts, customer concentrations, customer creditworthiness, current economic trends and changes in our customer payment terms when evaluating the adequacy of the allowance for doubtful accounts. As of March 31, 2014, the accounts receivable balance was $5,503,000, net of an allowance for doubtful accounts of $629,000, including a reserve for disputed credits, and an estimated returns reserve of $163,000. If the financial condition of our customers deteriorates, our actual losses may exceed our estimates, and additional allowances would be required.

We write down our inventory for estimated obsolescence or unmarketable inventory equal to the difference between the cost of inventory and the estimated market value based upon assumptions about future demand, market conditions and replacement costs. If actual future demand or market conditions are less favorable than those projected by us, additional inventory write-downs may be required.