January 13, 2011

MDA provides additional advanced technology solutions to Orbital's Cargo Delivery Spacecraft

Richmond, BC - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today that it has signed a multi-million dollar contract amendment exercising an option on the contract announced January 19, 2010. MDA will provide Orbital Sciences Corporation (Orbital) with solutions to enable capture and mating of the Cygnus(TM) cargo delivery spacecraft to the International Space Station.

The Cygnus(TM) spacecraft is being developed by Orbital under the Commercial Orbital Transportation Services Space Act Agreement with NASA. Several operational missions are expected to be conducted by Orbital in the coming years. MDA's proprietary, industry solution will be used to effect the berthing.

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.orbital.com