About 8x8, Inc.

The Company has provided in this release financial information that has not been prepared in accordance with Generally Accepted Accounting Principles (GAAP). Management uses these non-GAAP financial measures internally in analyzing the Company's financial results and believes they are useful to investors, as a supplement to GAAP measures, in evaluating the Company's ongoing operational performance. Management believes that the use of these non-GAAP financial measures provides an additional tool for investors to use in evaluating 8x8's ongoing operating results and trends and in comparing financial results with other companies in the industry, many of which present similar non-GAAP financial measures to investors.

Non-GAAP financial measures should not be considered in isolation from, or as a substitute for, financial information prepared in accordance with GAAP. Investors are encouraged to review the reconciliation of these non-GAAP financial measures to their most directly comparable GAAP financial measures. This reconciliation has been provided in the financial statement tables included below in this press release.

In addition, this release may provide certain financial measures that have been adjusted to exclude the impact of the discontinuation of a non-core, legacy DXI business (based on a voice message broadcasting service), as first reported in the third quarter of the Company's 2017 fiscal year. To adjust for the discontinued business, revenue figures for each period being compared exclude all revenue attributable to the discontinued business. None of the financial measures presented in this release reflect adjustments for comparison on a constant currency basis. Management concluded that the impact of currency fluctuations between current and comparative prior periods was not material for any of the financial results presented in this release.

Management has used these adjusted financial measures internally in evaluating the financial performance of the Company's business and believes they provide investors an additional, useful assessment of the Company's growth for these periods.

The Company has defined non-GAAP net income as net income for GAAP plus amortization of acquired intangible assets, stock-based compensation, other income and expenses, and the provision for or benefit from income taxes. Amortization of acquired intangible assets is excluded because it is a non-cash expense that management does not consider part of ongoing operations when assessing the Company's financial performance. Stock-based compensation expense has been excluded because it is a non-cash expense and relies on valuations based on future events, such as the market price of 8x8 common stock, that are difficult to predict and are affected by market factors that are largely not within the control of management. Certain other income and expense items, such as acquisition-related expenses, have been excluded because management considers them to be isolated transactions and believes they are not reflective of the Company's ongoing operations, reduce comparability of periodic operating results when included, are difficult to predict, and are often one-time. GAAP provision (benefit) for income taxes has been excluded as it is also a non-cash expense that management does not consider part of its analysis of the performance of ongoing operations. Non-GAAP net income before tax is then reduced by a projected annual non-GAAP effective tax rate in order to provide better consistency across the interim financial reporting periods. The Company's non-GAAP effective tax rate for the first and second quarters of fiscal 2018 was 36%. The projected annual effective tax rate may fluctuate over the interim periods for a variety of reasons, including significant changes in the geographic earnings mix, changes in the estimates of tax credits and deductions or changes in tax law in major jurisdictions where the Company operates. Management will evaluate and assess the appropriateness of this rate periodically, considering the impacts of significant events and changes in the operations of the Company.

The Company defines non-GAAP net income per share as non-GAAP net income divided by the weighted-average diluted shares outstanding which includes the effect of potentially dilutive stock options and awards. The Company defines non-GAAP net income percentage of revenue as non-GAAP net income divided by non-GAAP revenue.

Management believes that such exclusions facilitate comparisons to the Company's historical operating results and to the results of other companies in the same industry, and provides investors with information that management uses in evaluating the Company's performance on a quarterly and annual basis.

This news release contains "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995 and Section 21E of the Securities Exchange Act of 1934. These statements include, without limitation, information about future events based on current expectations, potential product development efforts, near and long-term objectives, potential new business, strategies, organization changes, changing markets, future business performance and outlook. Such statements are predictions only, and actual events or results could differ materially from those made in any forward-looking statements due to a number of risks and uncertainties. Actual results and trends may differ materially from historical results or those projected in any such forward-looking statements depending on a variety of factors. These factors include, but are not limited to:

• market acceptance of new or existing services and features;
• success of the Company's efforts to target mid-market and larger distributed enterprises;
• changes in the competitive dynamics of the markets in which the Company competes;
• the timing and extent of improvements in operating results from senior management changes and increased spending for marketing, sales and R&D;
• customer cancellations and rate of churn;
• the Company's ability to scale its business;
• the Company's ability to execute its global strategy;
• the Company's reliance on infrastructure of third-party network services providers;
• risk of failure in the Company's physical infrastructure;
• risk of failure of the software used to provide the Company's services;
• the Company's ability to maintain the compatibility of its software with third-party applications and mobile platforms;
• continued compliance with industry standards and regulatory requirements;
• risks relating to the Company's strategies and objectives for future operations, including the execution of integration plans and realization of the expected benefits of its acquisitions;

• the amount and timing of costs associated with recruiting, training and integrating new employees;
• introduction and adoption of the Company's cloud communications and collaboration services in markets outside of the United States;
• risks regarding compliance with regulations in the United States and foreign jurisdictions in which the Company's services are provided; and
• general economic conditions that could adversely affect the Company's business and operating results.

For a discussion of such risks and uncertainties, which could cause actual results to differ from those contained in the forward-looking statements, see "Risk Factors" in the Company's reports on Forms 10-K and 10-Q, as well as other reports that 8x8, Inc. files from time to time with the Securities and Exchange Commission. All forward-looking statements are qualified in their entirety by this cautionary statement, and 8x8, Inc. undertakes no obligation to update publicly any forward-looking statement for any reason, except as required by law, even as new information becomes available or other events occur in the future.

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Investor Contact:
Victoria Hyde-Dunn, 669-333-5200
victoria.hyde-dunn@8x8.com