Press Release

December 18, 2003

PalmSource and RIM to Jointly Develop BlackBerry Connectivity Support for Palm OS

Sunnyvale, Calif. and Waterloo, ON - PalmSource, Inc. (NASDAQ: PSRC) provider of Palm OS, a leading operating system powering next generation mobile devices and smartphones, and Research In Motion (RIM) (NASDAQ: RIMM; TSX: RIM), a leading developer of wireless solutions, have formalized their development relationship and have begun efforts to jointly develop a software client that enables BlackBerry® connectivity to Palm OS.

Following the recent announcement of the Palm Powered Mobile World program, the PalmSource and RIM agreement continues on this momentum by initiating the technology development phase of the relationship. RIM and PalmSource anticipate negotiating a technology distribution agreement for the BlackBerry connectivity solution on Palm OS at a later date.

The goal of this development effort is to create a BlackBerry connectivity solution for Palm OS licensees in the second half of 2004. This solution will be designed to provide Palm OS licensees the ability to connect their Palm Powered™ wireless handhelds and smartphones to BlackBerry Enterprise Server™ using the same secure push-based wireless architecture and infrastructure that currently supports thousands of companies and government organizations. The BlackBerry Connect™ solution for Palm OS will also support BlackBerry Web Client, a wireless Internet email service for individuals and small business that does not require server software.

“We view wireless data connectivity as being fundamental to the continuing growth and success of mobile devices and services around the world,” said Mike Lazaridis, president and co-CEO at Research In Motion. “Together, PalmSource and RIM are leveraging our respective strengths to provide licensees, carriers and developers with a strong wireless foundation to address a wide range of customer needs.”

“The development of BlackBerry connectivity for Palm OS offers our licensees and carrier partners an industry leading solution and further demonstrates our commitment to mobile data and enterprise solutions,” said David Nagel, president and chief executive officer for PalmSource. “We believe that Palm OS, together with RIM’s innovative BlackBerry connectivity will meet the growing needs of our customers and Palm OS developers.”

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. 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.

About PalmSource

PalmSource is the company behind Palm OS, a leading operating system powering more than 30 million Palm Powered handhelds and smartphones worldwide. Industry leaders Aceeca, AlphaSmart, Fossil, Foundertech, Garmin, GSL, HuneTec, Kyocera, Lenovo, palmOne, PerComm, Samsung, Sony, Symbol Technologies and Tapwave license Palm OS to create diverse mobile devices that meet unique customer needs. Palm OS has given rise to a large community of users, enterprises, developers and manufacturers, who together make up the Palm Economy. More information about PalmSource, Inc. is available on our website at http://www.palmsource.com, http://www.palmsource.co.uk, http://www.palmsource.fr, http://www.palmsource.de and http://www.palmsource.com.cn.

This press release contains forward-looking statements that involve risks and uncertainties, as well as assumptions that, if they never materialize or prove incorrect, could cause our results to differ materially from those expressed or implied by such forward-looking statements. Such forward-looking statements include, without limitation, statements related to the ongoing relationship of PalmSource and RIM; the development of the BlackBerry connectivity solution for Palm OS licensees in the second half of 2004; the anticipated technology distribution agreement; the development goals, features and functions of the BlackBerry connectivity solution for Palm OS licensees, as well as its ability to meet the growing needs of PalmSource licensees and developers. The risks and uncertainties that could cause our results to differ materially from those expressed or implied by such forward-looking statements include, without limitation, the ability of the parties to maintain the momentum of their relationship; to fund to completion the successful development and implementation of the BlackBerry connectivity solution for Palm OS in the second half of 2004 or in time to meet market demand, if any; the ability of the BlackBerry connectivity solution to provide the anticipated features, functions and benefits to Palm OS licensees and to meet the needs of or to be accepted by Palm OS licensees and developers; the ability with PalmSource and RIM to successfully negotiate and execute a technology distribution agreement; the outcome or initiation of patent infringement litigation; and the general economic conditions in the U.S. and abroad and other risks and uncertainties contained in PalmSource, Inc.’s public announcements, reports to stockholders and other documents filed with and furnished to the Securities and Exchange Commission, including our Quarterly Report on Form 10-Q for the period ended August 29, 2003 and in RIM's periodic reports filed with the United States Securities and Exchange Commission, and other regulatory authorities.. All forward-looking statements in this press release are based on information available to us as of the date hereof, and we assume no obligation to update these forward-looking statements.

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 RIM'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 RIM'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. Palm OS is a registered trademark and Palm Powered is a trademark of Palm Trademark Holding Company, LLC.