December 14, 2007

RADARSAT-2 has been successfully launched

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today that the RADARSAT-2 satellite has been launched into its proper orbit.

Alliance Spacesystems provides U.S. Government and aerospace customers with advanced technology solutions, and is a leader in sophisticated robotic and mechanical structures applied on a variety of space missions as well as terrestrial applications.

Daniel Friedmann, MDA’s president and CEO said ‘We are very pleased to see the RADARSAT-2 satellite successfully placed in orbit, and wish to thank our many dedicated employees and partners that worked on this exciting mission.

RADARSAT-2 is the result of a unique collaboration between MDA and the Canadian Space Agency.

RADARSAT-2 Lauch (Windows Media Ausio/Video file - 5,683 Kb)
Video credit: arianespace

MDA provides advanced information solutions that capture and process vast amounts of data, produce essential information, and improve the decision making and operational performance of business and government organizations worldwide.

Focused on markets and customers with strong repeat business potential, MDA delivers a broad spectrum of earth and space based information solutions, ranging from complex operational systems, to tailored information services, to electronic information products.

MDA employs more than 3,000 people in locations across the United States, the United Kingdom, and Canada. The Company's common shares trade on the Toronto Stock Exchange under the symbol. TSX:MDA.

Forward-Looking Statement
This release contains forward-looking statements and information, which reflect the current view of MacDonald, Dettwiler and Associates Ltd. with respect to future events and financial performance. Any such forward-looking statements are subject to risks and uncertainties and MDA's actual results of operations could differ materially from historical results or current expectations. Additional information on these and other potential factors that could affect MDA's financial results are detailed in documents filed from time to time with the applicable Canadian securities regulatory authorities.

The Toronto Stock Exchange has neither approved nor disapproved the form or content of this release.