Mitel Updates First Quarter 2011 Guidance

August 09, 2010

Mitel(R) (Nasdaq:MITL), a leading provider of unified communications software solutions, today announced that it expects revenue for the first quarter ending July 31, 2010 to be approximately $160M, compared to the previously provided range of $163 million to $167 million.

Mitel will provide more detail when it releases its financial results for the first quarter of fiscal 2011 and host a conference call for analysts and investors after the market closes on September 2, 2010. Details for the conference call will be announced prior to the date.

Forward-Looking Statements

Some of the statements in this press release, including statements regarding Mitel's expected revenue for the first quarter of fiscal 2011 and its financial outlook generally, are forward-looking statements (within the meaning of applicable U.S. and Canadian securities laws). Statements that include the words "may," "will," "should," "could," "estimate," "continue," "expect," "intend," "plan," "predict," "potential," "believe," "project," "anticipate" and similar statements of a forward-looking nature, or the negatives of those statements, identify forward-looking statements. In particular, this press release contains forward-looking statements pertaining to, among other matters: our future economic performance, profitability and financial condition; general global economic conditions; our business strategy, plans and objectives for future operations; our industry and the growth in the markets in which we compete; the costs of operating as a public company; and our research and development expenditures. These forward-looking statements reflect currently available information or our current views with respect to future events and are based on assumptions and subject to risks and uncertainties. In making these statements we have made assumptions regarding, among other things: no unforeseen changes occurring in the competitive landscape that would affect our industry generally or Mitel in particular; a stable or recovering economic environment; no significant event occurring outside the ordinary course of our business; and stable foreign exchange and interest rates. Actual events or Mitel's results, performance, financial position or achievements could differ materially from those contemplated, expressed or implied by such forward-looking statements as a result of various risks and uncertainties, including the risks factors described under the heading "Risk Factors" in Mitel's prospectus, dated April 21, 2010, which has been filed with the U.S. Securities and Exchange Commission and Canadian securities authorities. Except as required by law, Mitel is under no obligation to update any forward-looking statement, whether as a result of new information, future events or otherwise.

About Mitel

A global market leader in business communications powering more than two billion business connections, Mitel helps businesses and service providers connect, collaborate and provide innovative services to their customers. Our innovation and communications experts serve business users in more than 100 countries. For more information, go to www.mitel.com and follow us on LinkedIn and Twitter @Mitel.

Contact Information

Sandrine Quinton, Mitel

Tel: +33 1 30 96 43 01

Email: [email protected]

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