Press Release

PalmSource Announces Worldwide Mobile Summit and DevCon for May 23–26, 2005

Event to highlight new opportunities for PalmSource Licensees, Operators, Industry Partners and Developers

SUNNYVALE, Calif. – February 3, 2005 — PalmSource, Inc., (NASDAQ: PSRC) provider of Palm OS®, a leading operating system powering next generation mobile devices and smartphones, today announced it will hold its annual Developers Conference May 23 –26, 2005 in San Jose, California. This year the Company has added a Mobile Summit. The Mobile Summit has been designed to identify and explore new worldwide business opportunities for developers, licensees, operators and industry partners, showcase state–of–the–art wireless applications for smartphones, and provide valuable training and instruction on developing for the Palm OS platform. Registration for the conference is now open at www.palmsource.com/events.

PalmSource will also highlight its product roadmap for feature phones and Linux, leveraging its recent acquisition of China MobileSoft (CMS), a leading Chinese mobile phone software company. Additionally, PalmSource will showcase the latest information on Palm OS® Cobalt and provide attendees with the opportunity to learn about and experience the most recent mobile device developments from world class Palm OS licensees. "We are very excited to share the Company's future product and business plans on how to drive value with our current broadened product portfolio," said Larry Berkin, PalmSource director developer marketing. "We've added the Mobile Summit specifically to focus on business issues and new revenue generating opportunities for Palm OS developers."

Featuring keynotes from David Nagel, PalmSource president and CEO and other leading industry leading executives, the conference will feature detailed presentations from PalmSource licensees, operators and business partners.

Highlights of the PalmSource Mobile Summit and DevCon 2005 include:

• Presentations: from senior PalmSource executives, leading wireless operators and strategic partners covering technical and business issues in the mobile device and smartphone markets.
  


• In–depth sessions, delivered by the engineering team, on the Palm OS® Developer Suite: a free, open source based tool chain that provides developers with a powerful path for ARM–native development.
  


• Mobile Summit: a business–oriented track designed for a non–technical audience focusing on new business opportunities.
  


• Palm OS Wireless Application Development Training Course: this multi–day training course is for experienced C, C++ programmers to learn about wireless protocols and functions. The course includes extensive hands–on labs.
  


• A state–of–the–art Hardware Lab staffed with PalmSource engineers: featuring the latest Palm Powered™ devices the Hardware Lab provides "hands–on" access to a complete line of Palm Powered devices for testing and debugging.
  


• Palm OS Certified Developer Exam: the official PalmSource exam will be provided free–of–charge. A passing grade designates an "expert" developer allows the use of the Palm OS Certified Developer logo and a listing on palmsource.com.
  


• Meet PalmSource Partners Session: a roundtable session dedicated to industry networking. A chance to get up close and personal with industry leaders to discuss hot topics in an intimate setting.
  


• The New & Notables PR Program: provides a launch vehicle for developers to introduce new Palm OS applications and get exposure and coverage in the media and press.
  


• Powered Up Awards: the Powered Up Awards honor the most innovative and popular Palm OS® applications in the market. Winners will be announced at the Mobile Summit and DevCon 2005.
  


• A Super–charged Palm OS User Group Meeting (PUG): a PalmSource sponsored PUG meeting will be held on May 23, 2005. This free meeting is open to the public and will be co–hosted by local and regional user groups.
  

Conveniently located at the Fairmont Hotel in San Jose, California, registration is now open. Early Bird pricing for the three–day conference is $399, which ends April 1, representing a more than 40 percent savings off the $699 standard conference fee. A Companion Pass for additional attendees from the same company is only $199.

For more information and to register for the PalmSource Mobile Summit and DevCon 2005 visit www.palmsource.com/events or email events@palmsource.com.

About PalmSource
PalmSource, Inc. is the company behind Palm OS, a leading operating system powering mobile information devices. Approximately 37 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, www.palmsource.com/es and www.palmsource.com.cn.

CAUTIONARY NOTE REGARDING FORWARD–LOOKING STATEMENTS: This press release contains forward–looking statements that involve risks and uncertainties, as well as assumptions that 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 future products and business plans and revenue generating opportunities for Palm OS developers. 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 our future products and business plans to create value with our current product portfolio and to enable new revenue generating opportunities for Palm OS developers through the Mobile Summit and other business; the ability of Palm OS® developers to create new market opportunities using open–standards–based software development environments; 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 Reports on Form 10–Q for the periods ended August 27, 2004 and November 26, 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.

Copyright © 2005, PalmSource, Inc. PalmSource, Palm OS, Palm Powered, and certain other trademarks and logos appearing on this press release are trademarks or registered trademarks of PalmSource, Inc. or its affiliate in the United States, France, Germany, Japan, the United Kingdom, and other countries. These marks may not be used in connection with any product or service that does not belong to PalmSource, Inc. (except as expressly permitted by a license with PalmSource, Inc.), in any manner that is likely to cause confusion among customers, or in any manner that disparages or discredits PalmSource, Inc., its licensor, its subsidiaries or affiliates. All other brands and trademarks used herein are or may be trademarks of, and are used to identify other products or services of, their respective owners. All rights reserved.