May 13, 2010

MDA to provide further advanced technology solutions for continued use of the International Space Station

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today that it will provide advanced technology solutions for on-going operations of the International Space Station (ISS). These solutions will continue MDA's role in providing essential solutions for the on-going utilization of the ISS.

Two major components supplied by MDA, an enhanced platform for Dextre and a critical component for the ISS communication system are scheduled for launch tomorrow, on May 14, 2010.

Under a NASA contract, MDA developed an enhanced platform to provide Dextre, the highly-dexterous two-armed manipulator, with additional flexibility and versatility to perform maintenance tasks on the ISS.

A core component of the ISS communication system for critical video, and data delivery links between the ISS and Earth is also on board. The spare unit was upgraded by MDA under contract to The Boeing Company.

'For more than a decade we have successfully demonstrated advanced technology solutions for servicing in space,' said Steve Oldham, a vice president responsible for this business in MDA. 'While we look forward to on-going support of the ISS through 2020 and possibly longer, this unparalleled expertise uniquely positions MDA for future unmanned missions and exploration initiatives.'

Videos of the missions are available on the NASA web site:
Mission Videos

Artists rendering of Dextre outfitted with an Enhanced Orbital Temporary Platform (EOTP)

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.

The Company's common shares trade on the Toronto Stock Exchange under the symbol TSX:MDA.

Related Websites:
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. ("MDA") with respect to future events and financial performance. The forward-looking statements in this regard include statements regarding its role in providing essential solutions for the on-going utilization of the International Space Station (the "Solution"). Any such forward-looking statements are based on MDA's current expectations, estimates, projections and assumptions in light of its experience and its perception of historical trends. 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. The factors and assumptions underlying the forward-looking statements in this release include the Solution performing as expected. MDA cautions readers that should certain risks or uncertainties materialize, or should underlying assumptions prove incorrect, actual results may vary significantly from those expected. The risks that could cause actual results to differ from current expectations include inherent risks in unmanned missions and exploration initiatives, including general economic, regulations and competitor changes; changes in government priorities, funding levels, contracts and regulations; and failure to anticipate changes in technology, technical standards and advanced technology offerings or comply with the requisite standards.

For additional information with respect to certain of these risks or factors, plus additional risks or factors, reference should be made to MDA's continuous disclosure materials filed from time to time with Canadian securities regulatory authorities, which are available online at www.sedar.com or on MDA's website at www.mdacorporation.com.

The Toronto Stock Exchange has neither approved nor disapproved the form or content of this release.