Press Release

June 10, 2003

Nextel and RIM Announce Enterprise Java Developer Contest for BlackBerry 6510

JavaOne Conference - San Francisco, CA - Nextel Communications Inc. (NASDAQ:NXTL) and Research In Motion (RIM) (NASDAQ: RIMM; TSX: RIM) have launched The BlackBerry 6510 Extensibility Challenge (http://developer.nextel.com), a Nextel Enterprise Java 2 Platform, Micro Edition (J2ME) developer contest. The contest is designed to encourage the development of the most compelling J2ME technology-enabled applications to meet the demands of Nextel and RIM business subscribers.

The BlackBerry 6510 Extensibility Challenge is open to independent software vendors (ISVs) and developers that can build and support applications that leverage the Mobile Data Service feature of BlackBerry Enterprise Server and run on Nextel's iDEN network. The contest will focus on enterprise applications for key vertical segments including: transportation & logistics; financial & insurance; manufacturing & distribution; government/public sector and higher education; and utilities. With Nextel's leading wireless business solutions platform, developers can write applications to increase business productivity and meet the workplace demands of Nextel's subscribers. Nextel continues to be a leader in North America in the adoption of wireless data services with more than 20 percent of its domestic customer base - or more than 2.5 million Nextel customers - using Nextel's nationwide IP data network.

"As the first carrier in the U.S. to deliver Java technology-enabled handsets and a high wireless data penetration among our subscribers, the timing is right to focus on delivering J2ME applications to the enterprise on the BlackBerry 6510 from Nextel," said Blair Kutrow, vice president, product management, Nextel. "This contest reinforces our commitment to providing business customers with best-in-class wireless solutions, which operate on Nextel's nationwide packet data network."

Java technology enables developers to write advanced applications for the BlackBerry 6510 from Nextel that take advantage of the rich user interface, persistent memory, and ability to run select J2ME applications while in or outside of network coverage. Plus, Java allows companies to easily customize the applications they want for BlackBerry handhelds. Java technology also enhances Nextel's services, including Direct Connect, the digital two-walkie-talkie feature; digital cellular; text and numeric messaging; and Wireless Web access.

"We implemented J2ME in our advanced BlackBerry handhelds in order to provide a powerful, industry-standard development environment," said Mark Guibert, vice president, brand management, Research In Motion. "The BlackBerry 6510 Extensibility Challenge will help to promote the development of compelling wireless applications for our corporate customers."

Completed applications must be submitted by August 1, 2003. Three finalists will be invited to attend an awards ceremony to be held at Nextel's Center of Excellence in Reston, VA where they can present their applications to Nextel and RIM judges. Contestants will compete for the distinction of the title "Nextel's Enterprise J2ME Application Contest Winner of 2003," BlackBerry handhelds, the opportunity to showcase their application at the ceremony and other prizes. Entry application and contest rules can be found by visiting http://developer.nextel.com or http://www.blackberry.net/developers/na/programs/contest.shtml.

About Nextel

Nextel Communications, a Fortune 300 company based in Reston, Va., is a leading provider of fully integrated wireless communications services and has built the largest guaranteed all-digital wireless network in the country covering thousands of communities across the United States. Nextel and Nextel Partners, Inc., currently serve 198 of the top 200 U.S. markets. Through recent market launches, Nextel and Nextel Partners service is available today in areas of the U.S. where approximately 240 million people live or work.

About Nextel's Developer Program

The Nextel Developer Program facilitates the development of Java, WAP and SMS applications for the Nextel platform. Over 15,000 developers have registered to develop wireless applications for vertical, horizontal and corporate markets. Developers that register in the free program gain access to training, technical documentation, developer tools and online support. The program offers significant joint sales and marketing opportunities for developers with applications that fit Nextel's strategic direction. Developers interested in participating in the Nextel Developer Program should visit http://developer.nextel.com.

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.

Nextel, the Nextel logo, and Nextel Direct Connect are trademarks and/or service marks of Nextel Communications Inc.

The BlackBerry and RIM families of related marks, images and symbols are the exclusive properties of Research In Motion Limited. All other brands, products and company names mentioned herein may be trademarks or registered trademarks of their respective holders.

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.