June 16, 2010

Further update on RADARSAT Constellation Mission contract

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today that the Canadian Space Agency has extended its authorization for the Company to continue its work on the Design Phase (Phase C) of the RADARSAT Constellation Mission. This Authorization to Proceed is for $26.4 Million (CAD).

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
www.asc-csa.gc.ca