Plaintree Systems Announces CNQ Listing

OTTAWA--(Marketwire - September 22, 2008) - Plaintree Systems Inc. (OTCBB: PTEEF) ("Plaintree" or the "Company") is pleased to announce that it has received the approval to list its common shares on the Canadian Trading and Quotation System Inc. ("CNQ"). Plaintree will commence trading on Wednesday September 24, 2008, under the symbol "NPT." The CNQ will provide a Canadian market for the trading of Plaintree's shares in addition to the US OTCBB.

The CNQ was launched in 2003 and has established itself as an innovative stock exchange for the trading of equity securities of emerging companies. It provides a low cost, streamlined stock exchange with an extremely high standard of disclosure. This model, combined with comprehensive regulatory oversight, is designed to meet the needs of emerging companies, their investors, and investment dealers.

"We have put a lot of time, effort and money into the restructuring of the new Plaintree," said David Watson, CEO. "The last step was to again obtain a Canadian listing. Our new symbol, 'NPT' is an obvious salute to the new Plaintree. We are pleased to once again offer a Canadian vehicle to trade our shares and the CNQ represents a more cost effective market for this purpose than the OTCBB."

Shareholders and Investors can access Company information on CNQ's website and receive full Company disclosure monthly. For more information on Plaintree or to receive stoke quotes, complete with trading summaries, bid size and ask price, brokerage house participation, insider reports, news releases, disclosure information, and CNQ and SEDAR filing, visit the CNQ website at www.cnq.ca or the Company's website at www.plaintree.com.

About Plaintree Systems

Ottawa-based, Plaintree Systems Inc. (www.plaintree.com), founded in 1988 has three divisions. The first provides management services and specializes in developing optical wireless communications equipment for the local area, wide area, voice, Internet and security networks. The second manufactures avionic components for various applications. The third is a design/build manufacturer of steel, aluminum and stainless steel specialty structures.

Plaintree has 12,522,143 common shares and 18,325 class A preferred shares outstanding.

This press release may include statements that are forward-looking and based on current expectations. The actual results of the company may differ materially from current expectations. The business of the company is subject to many risks and uncertainties, including changes in markets for the company's products, delays in product development and introduction to manufacturing and intense competition. For a more detailed discussion of the risks and uncertainties related to the company's business, please refer to documents filed by the company on SEDAR (www.sedar.com) including the Company's proxy circular dated January 21, 2008 in relation to its annual and special meeting of shareholders held on March 18, 2008, proxy circular dated August 31, 2008 in relation to its annual meeting of shareholders to be held on September 30, 2008 and with the U.S. Securities and Exchange Commission, including the Company's Form 20-F dated September 28, 2007.