For immediate release: July 6, 2006

MDA Books Multiple Advanced Technology Contracts

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today that its recently acquired Montreal operation has booked two advanced technology contracts totaling over $17 million.

Under these contracts, MDA will provide data reception and transmission subsystems used in advanced solutions to provide regional satellite services in North America and Europe. The customers are Orbital Sciences Corporation and EADS Astrium.

"These contracts demonstrate the strength of our Montreal operation in providing advanced technology solutions to a variety of customers in different geographic markets.” said Mag Iskander, MDA’s Executive Vice President of Space Missions.

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:
http://www.mdacorporation.com/

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.