Press Release

PalmSource Releases PalmSource Web Browser 3.0

New Web Browser Offers Enhanced Performance and Ease-of-Use

MUNICH, Germany, PalmSource™ Euro DevCon, September 28, 2004 — PalmSource, Inc., (NASDAQ: PSRC) provider of Palm OS®, a leading operating system powering next generation mobile devices and smartphones, today announced the release of PalmSource Web Browser 3.0, providing Palm Powered™ smart mobile device users a rich browsing experience along with an intuitive, easy to use navigation capability. The PalmSource Web Browser 3.0 is specifically optimized for smartphones and wireless mobile devices.

PalmSource Web Browser 3.0 is designed to offer Palm OS licensees and mobile operators the flexibility to customize its interface based on the needs of their customers. Licensees and mobile operators can update the default home page, pre-provision bookmarks, customize settings specific to each operator's service and add navigation functions tailored to different mobile devices.

Built on the ACCESS NetFront core technology, PalmSource Web Browser 3.0 offers enhanced graphics rendering and navigation capability for the wireless delivery of information and streaming media. PalmSource Web Browser 3.0 uses technologies such as page zooming, scalable fonts and 'squeeze' rendering, allowing users to eliminate horizontal scrolling for easier navigation.

PalmSource Web Browser 3.0 is designed to support the latest W3C standard specifications including WAP 2.0, HTML and XHTML, enabling mobile device users to browse operator portals or traditional Web content. Smartphone and smart mobile device users with wireless connectivity can browse Web and WAP pages to shop, download games and music, watch and listen to news, connect to corporate intranets and access email. Enterprises and wireless shoppers will benefit from increased security with support for SSL (Secure Socket Layer) or TLS (Transport Layer Security) for secure communications and e-commerce transactions. PalmSource Web Browser 3.0 is also designed to support optional proxy settings for use in environments that require a proxy server.

For Web developers, the availability of PalmSource Web Browser 3.0 - with its broad support for Internet standards - means less development work is necessary to modify their Web content for viewing on Palm Powered devices. In addition, PalmSource Web Browser 3.0 supports the download and install of Palm OS applications, making it easy for smart mobile device users to find and install the latest Palm OS applications in as few steps as possible.

Developers will find documentation in the PalmSource Web Browser 3.0 software development kit (SDK) on how to best create content for the smaller screens of mobile devices and how to integrate their applications with the PalmSource Web Browser 3.0. The SDK also includes the browser application for use on the Palm OS Simulator, additional documentation, coding samples and libraries.

"PalmSource Web Browser 3.0 provides one of the most efficient means of gathering and displaying information on the smaller screens typical of today's smart mobile devices," said Charlie Tritschler, vice president of product marketing at PalmSource. "We believe that with support for proxy servers and secure transport protocols, PalmSource Web Browser 3.0 is ready to handle enterprise data securely and efficiently."

For more information on PalmSource Web Browser 3.0, visit the PalmSource Web site at www.palmsource.com.

About PalmSource
PalmSource, Inc. is the company behind Palm OS, a leading operating system powering mobile information devices. Approximately 35 million Palm Powered handhelds and smartphones have been sold to date worldwide. Industry leaders Aceeca, AlphaSmart, Fossil, Garmin, GSL, Kyocera, Lenovo, palmOne, QTech, 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 Powered Economy. More information about PalmSource is available at www.palmsource.com, www.palmsource.co.uk, www.palmsource.fr, www.palmsource.de and www.palmsource.com.cn.

Copyright ﾂｩ 2004, PalmSource, Inc. PalmSource, Palm Powered and Palm OS are trademarks or registered trademarks of PalmSource, Inc. or its affiliate in the United States, France, Germany, Japan, the United Kingdom, and other countries. All other brands, product names, company names, trademarks and service marks are the properties of their respective owners. All rights reserved.

Safe Harbor Statement
CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS: This press release contains forward-looking statements that involve risks and uncertainties, as well as assumptions 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 regarding the features, functions and benefits of PalmSource Web Browser 3.0. 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 PalmSource Web Browser 3.0 to provide the anticipated benefits including, without limitation, the ability of PalmSource Web Browser 3.0 to provide smart mobile device users with a rich browsing experience, exceptional graphics, navigation capability for the wireless delivery of information and streaming media; an intuitive, easy to use navigation capability; the ability to enable mobile operators to customize their interfaces based on the needs of their customers; the adoption of PalmSource Web Browser by Palm OS licensees and mobile operators; the ability of PalmSource to grow and maintain its developer community and to compete with existing and new competitors; the continued growth of the smartphone and wireless markets and the penetration of these markets by PalmSource and its licensees; and other risks and uncertainties contained in our public announcements, reports to stockholders and other documents filed with and furnished to the Securities and Exchange Commission, including our Annual Report on Form 10-K for the period ended May 28, 2004. 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.