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For immediate release: August 1, 2006

MDA Acquires a Second Legal Search Firm

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today the acquisition of Lee & Co. (Belfast) in Belfast, Northern Ireland. Lee & Co. (Belfast) has been providing property search information to the legal and financial sectors in Northern Ireland since 1923.

This acquisition complements MDA's acquisitions of The Rochford Brady Group in the Republic of Ireland and Lyttle & Co. in Belfast, Northern Ireland, announced earlier this year.

Daniel Friedmann, MDA President and CEO said: "This latest acquisition now provides MDA with a critical mass in both Northern Ireland and the Republic of Ireland, upon which to grow and to continue our strategy to become a leading supplier of property and legal information throughout all of the British Isles."

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.

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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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