Press Release

December 21, 2004

T-Mobile International Extends BlackBerry Range Through Introduction of "BlackBerry Connect" and "BlackBerry Built-In" For Mobile Professionals In Europe

Bonn, Germany and Waterloo, Ontario - T-Mobile International and Research In Motion (Nasdaq: RIMM; TSX: RIM) today announced plans to support a wider choice of devices with push-based BlackBerry® email services. Through the introduction of BlackBerry Connect™ and BlackBerry Built-In™, T-Mobile is extending the range of devices on which BlackBerry services are supported and available to business professionals in Europe.

Support for BlackBerry services will be initially introduced with T-Mobile’s popular organizer, the MDA II; and the rollout with other devices is expected to continue in early 2005 with T-Mobile’s MDA III, Sony Ericsson P910i, Siemens SK65 and Nokia 6820.

RIM’s BlackBerry Connect™ licensing program enables mobile device manufacturers to equip their handsets with the integrated ability to connect to BlackBerry Enterprise Server™ and BlackBerry Internet Service™.

With the BlackBerry Built-In™ licensing program, mobile device manufacturers can incorporate various BlackBerry applications into their own devices including BlackBerry Email™, BlackBerry Calendar™ and BlackBerry Browser™ applications.   The first device to support BlackBerry Built-In™ is the Siemens SK65.

T-Mobile International will now be able to offer a much wider choice of devices to suit the preferences and user needs of different staff within the enterprise, all managed on the same robust BlackBerry mobile data infrastructure.

“A widening range of mobile professionals are recognizing the productivity benefits of BlackBerry,” said Mark Guibert, Vice President, Corporate Marketing at RIM. “We are very pleased that T-Mobile International is broadening its BlackBerry offering with the introduction of BlackBerry Connect™ and BlackBerry Built In™.”

André Stark, Head of Business Marketing, T-Mobile International comments: “The extension of the BlackBerry service to a much wider range of new and stylish mobile phone handsets allows T-Mobile to address the needs of a broader target group of mobile workers which can now have a much larger variety of handsets to choose from.”

Stark continued: “Both user groups, those with preference for a small and handy voice phone as well as mobile workers with need for a feature rich wireless device will have the freedom to choose the device of their preference from a larger choice of BlackBerry enabled handsets from T-Mobile.”

BlackBerry platforms for both corporate and personal email use are supported. For corporate customers, BlackBerry Enterprise Server software tightly integrates with Microsoft® Exchange or IBM® Lotus® Domino® to enable secure, push-based, wireless access to email and calendar. For individuals and smaller businesses, BlackBerry Internet Service allows users to access multiple personal and/or corporate email accounts (including many popular ISP email accounts as well as Microsoft Exchange and IBM Lotus Domino accounts) from a single device.

 Availability of specific devices may vary by country.   Check with T-Mobile International for more information.

About T-Mobile International

T-Mobile International is one of the world's leading companies in mobile communications. As one of Deutsche Telekom`s three strategic business units, T-Mobile concentrates on the most dynamic markets in Europe and the United States. By Q3 of 2004, more than 109 million people were using the mobile communications services provided by companies in which T-Mobile or Deutsche Telekom have a majority or minority stake. And all that over a common technology platform based on GSM, the world's most successful digital wireless standard. This also makes T-Mobile the only mobile communications provider with a seamless transatlantic service.

T-Mobile also is partner of FreeMove, an alliance formed by four of Europe's leading mobile companies - Orange, Telefónica Móviles, TIM (Telecom Italia Mobile) and T-Mobile - to help their customers communicate as easily while travelling abroad as they do at home.

For more information about T-Mobile International, please visit www.t-mobile.net

About Research In Motion (RIM) 

Research In Motion is a leading designer, manufacturer and marketer of innovative wireless solutions for the worldwide mobile communications market. Through the development of integrated hardware, software and services that support multiple wireless network standards, RIM provides platforms and solutions for seamless access to time-sensitive information including email, phone, SMS messaging, Internet and intranet-based applications. RIM technology also enables a broad array of third party developers and manufacturers to enhance their products and services with wireless connectivity to data. RIM's portfolio of award-winning products, services and embedded technologies are used by thousands of organizations around the world and include the BlackBerry® wireless platform, the RIM Wireless Handheld™ product line, software development tools, radio-modems and software/hardware licensing agreements. Founded in 1984 and based in Waterloo, Ontario, RIM operates offices in North America, Europe and Asia Pacific. RIM is listed on the Nasdaq Stock Market (Nasdaq: RIMM) and the Toronto Stock Exchange (TSX: RIM). For more information, visit www.rim.com or www.blackberry.com.

Forward-looking statements in this news release are made pursuant to the "safe harbor" provisions of the United States Private Securities Litigation Reform Act of 1995. When used herein, words such as "intend" and similar expressions are intended to identify forward-looking statements. Forward-looking statements are based on assumptions made by and information available to Research In Motion Limited. Investors are cautioned that such forward-looking statements involve risks and uncertainties. Important factors that could cause actual results to differ materially from those expressed or implied by such forward looking statements include, without limitation, possible product defects and product liability, risks related to international sales and potential foreign currency exchange fluctuations, the initiation or outcome of litigation, acts or potential acts of terrorism, international conflicts, significant fluctuations of quarterly operating results, changes in Canadian and foreign laws and regulations, continued acceptance of Research In Motion's products, increased levels of competition, technological changes and the successful development of new products, dependence on third-party networks to provide services, dependence on intellectual property rights and other risks and factors detailed from time to time in Research In Motion's periodic reports filed with the United States Securities and Exchange Commission, and other regulatory authorities. The Company has no intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

The BlackBerry and RIM families of related marks, images and symbols are the exclusive properties and trademarks of Research In Motion Limited.  RIM, Research In Motion and BlackBerry are registered with the U.S. Patent and Trademark Office and may be pending or registered in other countries.  All other brands, product names, company names, trademarks and service marks are the properties of their respective owners.