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For immediate release: June 12, 2008

MDA extends relationship with NASA's Jet Propulsion Lab

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today MDA subsidiary, Alliance Spacesystems (Alliance) has signed a US $7.5 million, three-year contact with NASA's Jet Propulsion Laboratory (JPL) to provide a solution to support its mechanical and thermal engineering needs over multiple space missions. This contract also carries an additional two-year option for up to US $5 million.

Alliance 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.

René Fradet, president of Alliance Spacesystems stated, 'Alliance is very excited to be able to continue its previous five years support of the Jet Propulsion Laboratory for another five years. We look forward to continue to provide a key support role to JPL future exploration activities.'

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 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.

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Forward-Looking Statements

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 more information, please contact:

Wendy Keyzer
MDA External Relations
Telephone: 604-231-2743

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