IT Professionals Give Mitel Top Marks for Value, Customer
                      Service and Technology

OTTAWA, Aug. 20, 2012 (GLOBE NEWSWIRE) -- Mitel(R) (Nasdaq:MITL)
(TSX:MNW), a leading provider of Unified Communications and
Collaboration (UCC) software solutions, today announced it has won the
Market Challenger PilotHouse award for IP telephony products. Awarded
by Nemertes Research, the annual PilotHouse awards are uniquely
independent, as they provide analysis of vendor performance based on
interviews with IT decision-makers and professionals who use the
technology.

The awards assess performance in three categories: value, technology
and customer service. Mitel scored above 4.0 across all three
categories.

"Value is what leads Mitel to its first Market Challenger PilotHouse
Award," says Irwin Lazar, Vice President and Service Director at
Nemertes Research, "Mitel showed tremendous improvement in all ratings
areas over the last two years."

Mitel's score of 4.3 for "value" ranked first among all competitors
assessed in this category. A telecom manager of a small retail chain
remarked that the value it realized from Mitel's portfolio enabled the
organization to extend its deployment to much larger sites.

In addition, Mitel's focus on leveraging virtualization through its
partnership with VMware is paying dividends. "We're a VMware shop, and
we run VMware in our stores, so their alignment with VMware makes them
a natural choice for our telephony platform," said a director of IT for
a small retail company.

"We are very pleased with the results of Nemertes research as it
reflects the momentum we are seeing in the market," said Ron Wellard,
executive vice president of Mitel Communications

Solutions. "Our partnership with VMware and the realignment of the
company to focus on virtualization solutions have propelled us into a
leadership position in the industry. We are seeing tremendous traction
with organizations who want to maximize their return on investment by
deploying Mitel solutions to extend their business communications
capabilities."

About Mitel

Mitel (Nasdaq:MITL) (TSX:MNW) is a global provider of business
communications and collaboration software and services. Mitel's Freedom
architecture provides the flexibility and simplicity organizations need
to support today's dynamic work environment. Through a single
cloud-ready software stream, Mitel delivers a powerful suite of
advanced communications and collaboration capabilities that provides
freedom from walled garden architectures and enables organizations to
implement best-of-breed solutions on any network; extends the
"in-office" experience anywhere, on any device; and offers choice of
commercial options to fit business needs. For more information, visit:
http://www.mitel.com

Mitel and the Mitel logo are registered trademarks of Mitel Networks
Corporation.

All other trademarks are the property of their respective owners.

The Mitel Networks Corporation logo is available at
http://www.globenewswire.com/newsroom/prs/?pkgid=8599

MITL-C


CONTACT: Amy MacLeod (media)
         613-592-2122 x71245, amy_macleod@mitel.com
         
         Malcolm Brown (industry analysts)
         613-592-2122 x71246, malcolm_brown@mitel.com
         
         Cynthia Hiponia (investor relations)
         613-592-2122 x71997, investorrelations@mitel.com