The DigitalGlobe name, brand and headquarters in Westminster will be maintained. In addition, three of DigitalGlobes current directors will be appointed to the MDA Board of Directors. The combined company will have approximately 4,600 employees in the United States and will continue to employ more than 1,800 in Canada.

APPROVALS

The transaction is subject to customary closing conditions, including required regulatory approvals, as well as approval by both MDA and DigitalGlobe shareholders. MDA and DigitalGlobe will continue to operate as separate companies until the closing of the transaction.

ADVISORS

BofA Merrill Lynch is serving as financial advisor, and Vinson & Elkins LLP and Stikeman Elliott LLP are serving as legal counsel, to MDA. RBC Capital Markets is serving as financial and capital markets advisor to MDA, and BMO Capital Markets provided a fairness opinion. Fully committed financing for the transaction is being provided by Royal Bank of Canada and BofA Merrill Lynch.

PJT Partners and Barclays are serving as financial advisors, and OMelveny & Myers LLP is serving as legal counsel, to DigitalGlobe. PJT Partners and Barclays provided fairness opinions to DigitalGlobe.

INVESTOR AND MEDIA CONFERENCE CALL AND WEBCAST

Executives from MDA and DigitalGlobe will host a call for the investment community and media today at 5:30 AM Pacific time / 8:30 AM Eastern time to discuss the transaction. To access the conference call, please dial (855) 212-2368 in Canada and the United States, or +1 (315) 625-6886 from other countries, and reference conference ID # 74632653. A slide presentation and the live audio webcast will be available and archived on both companies websites.

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

Certain statements and other information included in this press release constitute forward-looking information or forward-looking statements (collectively, forward-looking statements) under applicable securities laws, including the Private Securities Litigation Reform Act of 1995. Statements including words such as may, will, could, should, would, plan, potential, intend, anticipate, believe, estimate or expect and other words, terms and phrases of similar meaning are forward-looking statements. Forward-looking statements involve estimates, expectations, projections, goals, forecasts, assumptions, risks and uncertainties. Such forward-looking statements include, but are not limited to, statements as to MDAs and DigitalGlobes managements expectations with respect to: the benefits of the transaction, including future financial and operating results, and strategic and integration opportunities; the combined companys plans, objectives, expectations and intentions; expectations for sales growth, synergies, earnings and performance; shareholder value; and other statements that are not historical facts. This press release also contains forward-looking statements regarding the anticipated completion of the transaction and timing thereof.

Forward-looking statements in this press release are based on certain key expectations and assumptions made by MDA and DigitalGlobe, including expectations and assumptions concerning: market and general economic conditions; growth in demand for products and services of the combined company; currency exchange and interest rates; planned synergies, capital efficiencies and cost-savings; applicable tax laws; future debt ratings; the availability and cost of labor, services and materials; and the receipt, in a timely manner, of regulatory, stock exchange, shareholder and other third party approvals in respect of the transaction. Although management of MDA and DigitalGlobe believe that the expectations and assumptions on which such forward-looking statements are based are reasonable, undue reliance should not be placed on the forward-looking statements because MDA and DigitalGlobe can give no assurance that they will prove to be correct.

Forward-looking statements are subject to various risks and uncertainties which could cause actual results and experience to differ materially from the anticipated results or expectations expressed in this press release. Some of the key risks and uncertainties include, but are not limited to: changes in government priorities, mandates, policies, funding levels, contracts and regulations, including the grant and maintenance of security clearances, loss or reduction in scope of any of our primary contracts, or decisions by customers not to exercise renewal options; growth in the businesses of our customers and the ability of our customers to develop new services; inherent risks of performance on firm fixed price construction contracts and termination of contracts by customers for convenience; decrease in demand for our products and services; failure to maintain technological advances and offer new products to retain customers and market position; reliance on a limited number of vendors to provide certain key products or services to us; breach of our system security measures or loss of our secure facility clearance and accreditation; the loss or damage to any of our satellites; delays in the construction and launch of any of our satellites or our ability to achieve and maintain full operational capacity of all our satellites; potential for product liability or the occurrence of defects in products or systems and resulting loss of revenue and harm to our reputation; detrimental reliance on third parties for data; interruption or failure of our ground systems and other infrastructure; increased competition that may reduce our market share or cause us to lower our prices; changes in political or economic conditions, including fluctuations in the value of foreign currencies, interest rates, energy and commodity prices, trade laws and the effects of governmental initiatives to manage economic conditions; our ability to recruit, hire or retain key employees or a highly skilled and diverse workforce; potential for work stoppages; failure to obtain or maintain required regulatory approvals and licenses; failure to comply with environmental regulations; and changes in U.S., Canadian or foreign law or regulation that may limit our ability to distribute our products and services. There are also risks that are inherent in the nature of the transaction, including: failure to realize anticipated synergies or cost savings; risks regarding the integration of the two companies; and failure to obtain any required regulatory and other approvals (or to do so in a timely manner). The anticipated timeline for completion of the transaction may change for a number of reasons, including the inability to secure necessary regulatory, stock exchange or other approvals in the time assumed or the need for additional time to satisfy the conditions to the completion of the transaction. As a result of the foregoing, readers should not place undue reliance on the forward-looking statements contained in this press release concerning the timing of the transaction. Additional information concerning these and other risk factors can be found in MDAs filings with Canadian securities regulatory authorities, which are available online under MDAs profile at  www.sedar.com or on MDAs website at  www.mdacorporation.com, and in DigitalGlobes filings with the United States Securities and Exchange Commission, including Item 1A of DigitalGlobes Annual Report on Form 10-K for the year ended December 31, 2015.

The forward-looking statements contained in this press release are expressly qualified in their entirety by the foregoing cautionary statements. All such forward-looking statements are based upon data available as of the date of this release or other specified date and speak only as of such date. MDA and DigitalGlobe disclaim any intention or obligation to update or revise any forward-looking statements in this press release as a result of new information or future events, except as may be required under applicable securities legislation.

ADDITIONAL INFORMATION ABOUT THE MERGER AND WHERE TO FIND IT

This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities or a solicitation of any vote or approval. This communication may be deemed to be solicitation material in respect of the proposed merger of DigitalGlobe, Inc. (DigitalGlobe) with a wholly owned subsidiary of Macdonald, Dettwiler and Associates Ltd. (MDA). In connection with the proposed merger, MDA intends to file a registration statement on Form F-4 with the U.S. Securities and Exchange Commission (SEC), which will include a preliminary proxy statement of DigitalGlobe that also constitutes a preliminary prospectus of MDA. After the registration statement is declared effective, MDA and DigitalGlobe will mail the definitive proxy statement/prospectus to DigitalGlobes stockholders. The definitive proxy statement/prospectus will contain important information about the proposed merger and related matters. STOCKHOLDERS OF DIGITALGLOBE ARE URGED TO READ ALL RELEVANT DOCUMENTS FILED WITH THE SEC, INCLUDING THE DEFINITIVE PROXY STATEMENT/PROSPECTUS (INCLUDING ALL AMENDMENTS AND SUPPLEMENTS), CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT DIGITALGLOBE AND THE MERGER. Stockholders will be able to obtain copies of the proxy statement/prospectus and other relevant materials (when they become available) and any other documents filed with the SEC by DigitalGlobe for no charge at the SECs website at  www.sec.gov. Copies of the documents filed with the SEC by MDA also can be obtained free of charge on MDAs corporate website at  www.mdacorporation.com  or by contacting MDAs Investor Relations Department by telephone at (604) 331-2044 or by mail to MDA, Attention: Investor Relations Department, Suite 1570 - 200 Burrard Street, Vancouver, BC V6C 3L6. Copies of the documents filed with the SEC by DigitalGlobe also can be obtained free of charge on DigitalGlobes corporate website at  www.digitalglobe.com  or by contacting DigitalGlobes Investor Relations Department by telephone at (303) 684-4000 or by mail to DigitalGlobe, Attention: Investor Relations Department, 1300 W. 120th Ave., Westminster, CO 80234.