Mitel to Start Trading on TSX on June 27, 2012

OTTAWA, June 27, 2012 (GLOBE NEWSWIRE)

Mitel (Nasdaq:MITL) (TSX:MNW), a leading provider of Unified Communications and Collaboration (UCC) software solutions, today announced that Mitel's common shares will begin trading today on the Toronto Stock Exchange (TSX) under the symbol, "MNW". The Company will not issue any additional shares in connection with the TSX listing. The Company will retain its listing on NASDAQ under the trading symbol "MITL."

About Mitel

Mitel Networks (Nasdaq:MITL) (TSX:MNW) is a global provider of business communications solutions and services, consisting of unified communications and collaboration software applications, IP telephony platforms, mobility applications and managed and network services. Mitel enables businesses of all sizes to move beyond basic fixed telephony tools toward integrated multi-media collaboration solutions, accessible from anywhere, helping to improve performance, gain competitive advantage, and reduce costs. Mitel's global headquarters are in Ottawa, Canada, US headquarters are in Chandler, Arizona and EMEA headquarters are in Caldicot, UK, with offices, partners, and resellers worldwide. For more information visit: http://www.mitel.com.

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Contact Information

Amy MacLeod 613-592-2122 x71245 amy_macleod@mitel.com Cynthia Hiponia (investor relations) 613-592-2122 x71997 investorrelations@mitel.com

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