Mitel Announces Fourth Quarter and Fiscal Year 2010 Financial Results Conference Call

June 01, 2010

Mitel Networks Corporation (Nasdaq:MITL), a trusted provider of unified communications software solutions, today announced that it will release its fourth quarter and fiscal year 2010 financial results after the market closes on Wednesday, June 30, 2010.

The company will host an investor conference call and live webcast at 5:00 p.m. EDT (2:00 p.m. PDT) on the same day. To access the conference call, dial 888-857-6930 and enter pass code 9175482. Callers outside the US and Canada should dial 719-325-2100 and enter pass code 9175482. The webcast will be accessible on Mitel's investor relations website at http://investor.mitel.com/.

A replay of the conference call will be available through Monday, July 5, 2010. To access the replay, please dial 888-203-1112 and enter pass code 9175482. Callers outside the US and Canada should dial 647-436-0148 and enter pass code 9175482.

About Mitel

A global market leader in business communications powering more than two billion business connections, helps businesses and service providers connect, collaborate and provide innovative services to their customers. Our innovation and communications experts serve more than 70 million business users in more than 100 countries. For more information, go to www.mitel.com and follow us on Twitter @Mitel.

Mitel is the registered trademark of Mitel Networks Corporation

All other trademarks are the property of their respective owners

Contact Information

Camille Beasley, Media

Tel: 469-212-0433

Email: camille.beasley@mitel.com

Denise Hogberg, Industry Analysts

Tel: 469-212-0434

Email: denise.hogberg@mitel.com

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