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For immediate release: April 26, 2004

MDA Conference Call And Presentation Alert

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA) will hold a conference call and webcast at 8:30 A.M. Eastern / 5:30 A.M. Pacific on April 27, 2004 to announce a major strategic acquisition. The call will consist of a 25 minute presentation based on slides that will be available on MDA's website 10 minutes before the call, and a question and answer session. A news release will be disseminated prior to the call. The presentation will be conducted by Daniel Friedmann, MDA's President and CEO. Mr. Friedmann, Anil Wirasekara, MDA's Executive Vice President and CFO, and John Geddes, MDA's Vice President, Business Development, will respond to callers' questions after the presentation has concluded. To participate, please call the conference line approximately five minutes prior to the commencement of the call:

Toll free in North America: 1-866-546-6145

In Toronto: 416-406-4206

The slide presentation and live or archived webcast will be available at:

http://www.mdacorporation.com/corporate/investor/events
About MacDonald, Dettwiler and Associates Ltd. (MDA) MacDonald, Dettwiler and Associates Ltd. (TSX: MDA) is an information company that provides customers around the world with essential information used for decision making. Operating through two groups -- Information Products and Information Systems, MDA is active in data collection, information extraction, and information distribution. More information on MDA can be found at www.mda.ca



For more information, please contact:

Wendy Keyzer
MDA External Relations
Telephone: 604-231-2743
E-mail: wendy@mdacorporation.com


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