Press Release

PalmSource Welcomes Third Palm Powered Smartphone from GSPDA

Xplore M28 Builds Momentum for Palm Powered Smartphones in Asia

SUNNYVALE, Calif., November 22, 2004 — PalmSource, Inc. (NASDAQ: PSRC) provider of Palm OS®, a leading operating system powering next generation mobile devices and smartphones, today welcomed the third Palm Powered™ smartphone from GSPDA, the Xplore M28. Alpha Tech Mobile Sdn Bhd is distributing the Palm Powered Xplore M28 smartphone in Malaysia. The Xplore M28 smartphone is now also available to wireless customers in China, Hong Kong and Macau and Thailand.

The Xplore M28 joins the existing family of GSPDA smartphones, including the G18 and G88, to provide mobile users with a full-featured smartphone that integrates traditional Palm OS® PIM functionality and telephony features in a sleek and compact form factor. Based on Palm OS Garnet, the Xplore M28 boasts a built-in VGA camera with digital zoom, MP3 and MPEG4 support, 64 MB RAM / 32MB SDRAM Flash Internal Memory Card, high quality color 2.2 inch D-TFD 65K colors LCD screen, SMS / MMS / WAP / e-mail / Java support and up to 1GB of memory capacity with Secure Digital (SD) /Multimedia Card (MMC). In addition, the Xplore M28 features a sliding numeric keypad and one-handed navigation five-way jog dial to fit the natural habits of mobile phone users.

"Combining our strength in building innovative smartphones with the flexibility of Palm OS has enabled us to provide our customers with easy-to-use wireless products that deliver a superior telephony and multimedia user experience," said Thomas Tam, Managing Director, GSL Group Sense (International) Ltd. "We look forward to our continued collaboration with PalmSource to expand the reach of our smartphones into new markets worldwide."

"We believe the new Xplore M28 smartphone will build momentum for Palm Powered smartphones and create new business opportunities for Palm OS software developers in the Asian wireless market," said David Nagel, president and chief executive officer of PalmSource. "We look forward to our continued collaboration with GSPDA to bring more innovative Palm Powered smartphones to market that meet the needs of wireless users."

Palm Powered™ smartphones are sold by over 30 of the world's top wireless carriers worldwide, making Palm OS a leading platform for the development and deployment of wireless devices. The Palm OS® platform is designed with an open, modular architecture that gives licensees and software developers the flexibility to create differentiated products and solutions for various markets. With over 25,000 Palm OS software titles available today, the Palm OS platform offers one of the largest third-party software catalogs to enable users to customize their Palm Powered smart mobile devices to fit particular needs. Choosing Palm OS opens up new business channels for hardware manufacturers and software developers and provides the opportunity to broaden their reach into the smartphone and wireless device markets.

Pricing and Availability
The Xplore M28 smartphone is now available in Malaysia and is being distributed by Alpha Tech Mobile Sdn Bhd. The Xplore M28 smartphone is now available in China, Hong Kong and Macau and Thailand. The retail price is RM 2,288. For more information, please visit www.alphatech.com.my.

About PalmSource
PalmSource, Inc. is the company behind Palm OS®, a leading operating system powering mobile information devices. Approximately 36 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 related to features, functions and benefits of the Xplore 28 smartphone and the Palm OS platform; and GSPDA's ability to reach new market segments in collaboration with us. 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 Xplore 28 smartphone to provide the anticipated results and benefits including its conformance to the natural habits of mobile phone users and a superior telephony and multimedia user experience; acceptance of the Xplore 28 by end users in new markets worldwide; GSPDA's ability to compete with existing or new competitors; realization of the anticipated momentum for Palm Powered smartphones resulting from introduction of the Xplore 28, as well as creation of new business opportunities for Palm OS software developers in the Asian wireless market; continued acceptance of the Palm OS platform by software developers; our ability to grow and maintain our software developer community and to compete with existing and new competitors; our ability to successfully collaborate with GSPDA to bring additional innovative Palm Powered smartphones to market; our ability to benefit from any growth in the smart mobile device markets; and the general economic conditions in the U.S. and abroad 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 and our Quarterly Report on Form 10-Q for the period ended August 27, 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.