Media Alert - MDA's Fourth Quarter 2007 preliminary results conference call alert

    RICHMOND, BC, Feb. 22 /CNW/ - MacDonald, Dettwiler and Associates Ltd.
(TSX: MDA), a provider of essential information solutions, plans to release
preliminary unaudited Fourth Quarter 2007 financial results at 5:00 p.m.
Eastern Time (2:00 p.m. Pacific Time) on Tuesday, February 26, 2008.
    MDA will host a conference call, featuring remarks by President and CEO,
Daniel Friedmann and Anil Wirasekara, Executive Vice-President and CFO,
followed by a Q&A session.
    The call is scheduled to begin promptly at 5:30 p.m. Eastern Time (2:30
p.m. Pacific Time).
    To participate, please call the conference line approximately five
minutes prior to the commencement of the call:

    In Canada or the United States: 1-888-575-8232
    In Toronto: 416-406-6419

    The conference call will also be Webcast live and then archived at:

    Telephone replay will be available until March 4, 2008 at the following

    Toll free: 1-800-408-3053
    In Toronto: 416-695-5800
    Pass Code: 3253048

    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
    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.

    Related Websites:

    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 further information:

For further information: Wendy Keyzer, MDA External Relations, (604)

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