Press Release

PalmSource Launches New Online Tools for Palm OS User Groups

New Tools Facilitate Communication and Simplify Administration for the Palm OS User Group Community

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 launch of the official Palm OS User Group (PUG) Web site on palmsource.com. In addition, PalmSource is launching three new tools, an online calendar, searchable database of worldwide PUGs and a discussion forum, to help PUG leaders manage and promote their user group meetings and connect with other PUG leaders.

PUGs bring together Palm OS users from around the world and are a central component for users to discover new features, get user-to-user support, view software and hardware demonstrations and gather information on the Palm Powered™ economy. Participating in a PUG offers end-users an opportunity to connect and stay in touch with the new developments in the fast-moving Palm OS ecosystem.

The new tools being launched include an aggregated, online calendar for users and members to see when and where PUG meetings are happening across the globe. The Web site also includes a searchable database of worldwide PUGs enabling users to find a Palm OS User Group in their area. Additionally, a new PUG-leader only discussion forum facilitates communication and information sharing among leaders providing a critical support mechanism to discuss best practices, share knowledge and release information to the PUG leader community worldwide.

PalmSource plans to launch functionality that will provide PUG leaders with the ability to manage their PUG membership information and member communications, simplifying the administrative tasks associated with running a local PUG.

"The new Palm OS User Group Web site allows PUG leaders to connect with each other and more effectively promote the user group resource," said Chuck Horner, president of the Personal Computing Community — Palm OS® User Group in Hayward, Calif. "Palm OS User Groups worldwide can now share their knowledge and experience more easily, allowing independent PUGs to operate as a more cohesive unit."

Palm Powered device users interested in learning more about Palm OS User Groups can visit usergroups.palmsource.com for information and listings on PUG events taking place around the globe. Users can also sign up to receive the Palm OS User Group Newsletter, a monthly dispatch covering topics of interest to the Palm OS community, including feature articles, tips and tricks, news blasts, event information, contests and more.

"We believe that providing these tools to PUGs will allow them to expand their membership and provide an effective marketing vehicle for Palm OS developers to more easily launch new applications by efficiently leveraging the word-of-mouth marketing of this community," said Larry Berkin, director of worldwide developer and user group marketing at PalmSource. "We're pleased at the early response from PUG leaders and look forward to growing PUG membership by providing essential resources to PUGs worldwide."

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 Palm OS developer applications. 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, PalmSource's ability to maintain and grow its developer community and to strengthen the Palm Powered economy and to realize a benefit from the PUG marketing community; 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.