Research In Motion Debuts First Wireless Handheld Based Entirely on Sun Microsystems' Java™ 2 Platform, Micro Edition (J2ME™)

J2ME-Based BlackBerry Wireless Handheld Demonstrated at JavaOneSM Conference

SAN FRANCISO, CA - June 4, 2001 - Research In Motion Limited (RIM) (Nasdaq: RIMM; TSE: RIM), a world leader in the mobile communications market, and Sun Microsystems, Inc. (Nasdaq: SUNW) today announced one of the first Java™ technology-based wireless handhelds at the JavaOne conference this week. Going beyond standard KVM integration, RIM has implemented Java 2 Micro Edition (J2ME) as the core operating system for the BlackBerry wireless handheld and has ported BlackBerry applications to work on J2ME. This design will allow third party applications to tightly integrate with built-in BlackBerry applications such as calendar and email.

Java technology provides an industry standard programming platform that significantly eases the development and deployment of wireless applications. The J2ME platform is optimized for wireless handhelds and in combination with the Connected Limited Device Configuration (CLDC) and Mobile Information Device Profiles (MIDP), offers a robust, portable environment for the creation of new wireless applications. Support for J2ME opens development of new applications for BlackBerry to more than two and a half million Java technology developers, according to Sun Microsystems.

"Sun's J2ME provides an open, robust application development environment for RIM and its partners," said David Yach, Vice President, Software at Research In Motion. "We have fully integrated J2ME as the core operating system on our next-generation of 2.5G BlackBerry handhelds, allowing for an unprecedented level of application integration and functionality."

"By optimizing the Java Virtual Machine and porting BlackBerry applications in their entirety to J2ME, RIM has created a solid, secure, extendable handheld environment with a quick, responsive and easy-to-use interface," said Rich Green, Vice President and General Manager, Java Software, Sun Microsystems. "Sun strives to work with industry leaders such as RIM to advance the J2ME open standards platform for the wireless industry."

At the JavaOne developers conference this week, RIM is demonstrating its J2ME-based BlackBerry platform. RIM's Development Environment for J2ME will be based on open standards and will include a device simulator and real-time debugger with a full suite of integrated utilities to help quickly build, test and deploy applications. Compliance with J2ME, CLDC and MIDP specifications provides a "Write Once, Run Anywhere" cross-platform environment that will attract and support a broad base of developers. RIM's Development Environment for Java technology is expected to be publicly available later this year. Until then, developers are also encouraged to use Sun's wireless J2ME toolkit available at www.java.sun.com/j2me.

BlackBerry Enterprise Edition is a proven, secure and complete wireless email solution that integrates the industry's most advanced wireless handhelds with enterprise server software, end-to-end encryption technology, desktop utilities and nationwide wireless networks. BlackBerry Enterprise Edition™ supports both Microsoft Exchange and Lotus Domino environments and incorporates a unique security architecture for encrypting all incoming and outgoing wireless email using Triple DES (Data Encryption Standard). BlackBerry Wireless Handhelds deliver award-winning wireless technology in sleek, ergonomic devices with large, crisp displays and easy-to-use keyboards.

About RIM

Research In Motion® Limited is a leading designer, manufacturer and marketer of innovative wireless solutions for the mobile communications market. Through development and integration of hardware, software and services, RIM® provides solutions for seamless access to time-sensitive information including email, messaging, Internet and intranet-based applications. RIM technology also enables a broad array of third party developers and manufacturers around the world to enhance their products and services with wireless connectivity. RIM's portfolio of award-winning products includes the RIM Wireless Handheld™ product line, the BlackBerry™ wireless email solution, embedded radio-modems and software development tools. Founded in 1984 and based in Waterloo, Ontario RIM operates offices in Canada, the United States and England. RIM is listed on the Nasdaq Stock Market and the Toronto Stock Exchange. For more information, visit www.rim.net. Investors may contact investor_relations@rim.net. Customers may contact info@rim.net.

About Sun Microsystems, Inc.

Since its inception in 1982, a singular vision -- "The Network Is The Computer™" -- has propelled Sun Microsystems, Inc. (Nasdaq: SUNW), to its position as a leading provider of industrial-strength hardware, software and services that power the Internet and allow companies worldwide to dot-com their businesses. With $19.2 billion in annual revenues, Sun can be found in more than 170 countries and on the World Wide Web at http://sun.com.

About BlackBerry

Key Features of the BlackBerry Wireless Email Solution:

• Advanced wireless handhelds - slim and lightweight, embedded wireless modem (no external antenna needed), thumb-operated keyboard and trackwheel, large backlit screen and integrated email/organizer software.
• Single mailbox integration with corporate email systems - allows users to keep their existing email address and manage one single mailbox.
• Powerful email features - read, originate, forward, reply, delete or file messages using the wireless handheld (inbox and folders are synchronized between the wireless handheld and PC); user-selectable message filters allow user to control email flow.
• Full-featured connected organizer - includes calendar, address book, task list, memo pad, calculator and alarm; synchronizes with PC.
• 'Always On, Always Connected™'* - designed to operate 24 hours per day while remaining connected to the wireless network to allow easy notification of incoming email; uses "push model" of email delivery; email automatically finds the user; no dialing-in; no initiating connections; no effort required.
• End-to-end security - email is encrypted using Triple DES and remains encrypted at all points between the PC (or server) and wireless handheld; meets strict corporate security guidelines for company-confidential information.
• BlackBerry Enterprise Server - enterprise server software provides centralized management and control with a scalable architecture.
• End-to-end solution - customers receive easy-to-use wireless handhelds, productive desktop utilities, innovative server software and nationwide airtime on a leading network in one completely integrated solution.

Research In Motion, RIM and BlackBerry are trademarks of Research In Motion Limited. Research In Motion and RIM are registered with the U.S. Patent and Trademark Office and may be pending or registered in other countries. 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. Investors are cautioned that such forward-looking statements involve risks and uncertainties, including, without limitation, risks relating to possible product defects and product liability, risks related to international sales and potential foreign currency exchange fluctuations, risks related to the year 2000 issue, continued acceptance of RIM's products, increased levels of competition, technological changes, dependence on intellectual property rights and other risks detailed from time to time in RIM's periodic reports filed with the United States Securities and Exchange Commission and other regulatory authorities.

Sun, Sun Microsystems, the Sun Logo, Java, J2SE, Java Community Process, JavaOne, Java 2D, Java Server Pages, Solaris, The Network Is The Computer are trademarks or registered trademarks of Sun Microsystems, Inc. in the United States and other countries. All other third party product or service names mentioned herein are the property of their respective owners.