MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, today announced that RADARSAT-2 completed its commissioning on April 25, 2008 and fully transitioned into commercial operations to deliver advanced radar images of the Earth. Launched from Baikonur Cosmodrome on December 14, 2007, RADARSAT-2 delivered its first sample high-resolution radar images on December 18, 2007.

MDA President and CEO Daniel Friedmann said, “We are extremely pleased to announce the completion of the RADARSAT-2 commissioning, and are excited by the excellent performance of this important new satellite and its extended suite of data products. This milestone, and the overall success of this project, is directly related to the talented workforce of MDA and our subcontractors, and the great cooperation between the Canadian Space Agency and MDA throughout the development and build phases.”

RADARSAT-2 is the result of a unique collaboration between MDA and the Canadian Space Agency. The satellite provides the follow-on to the RADARSAT-1 mission, serving data users around the world with new imaging modes, data with higher information content, and more responsive programming and delivery services. It will directly supply the growing global market for commercial high-resolution radar imagery.

About MDA

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.

Related Websites:

www.mdacorporation.com

www.space.gc.ca

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.

For further information

Wendy Keyzer, MDA External Relations, (604) 231-2743, wendy@mdacorporation.com