Press Release

PalmSource Schedules Third Quarter Fiscal Year 2004 - Results & Conference Call For March 18

SUNNYVALE, Calif. 窶・March 4, 2004 — PalmSource, Inc. (NASDAQ: PSRC) provider of Palm OS®, a leading operating system powering next generation mobile devices and smartphones, will release results for the third quarter of fiscal 2004 on Thursday, March 18th, 2004 after market close. David Nagel, president & chief executive officer and Al Wood, chief financial officer, will discuss third quarter 2004 results and business outlook on a conference call scheduled for 5:00 p.m. Eastern Standard Time / 2:00 p.m. Pacific Standard Time that same day.

A live and archived webcast of this call can be accessed at PalmSource窶冱 web site at http://www.palmsource.com/about/ir.html. The webcast is also being distributed over CCBN's Investor Distribution Network to both institutional and individual investors through CCBN's individual investor center at www.companyboardroom.com, by visiting any of the investor sites in CCBN's Individual Investor Network or via CCBN's password-protected event management site, StreetEvents (www.streetevents.com).

About PalmSource
PalmSource, Inc. is the company behind Palm OS, a leading operating system powering mobile information devices. Approximately 30 million Palm Powered handhelds and smartphones have been sold to date worldwide. Industry leaders Aceeca, AlphaSmart, Fossil, Founder Technology, Garmin, GSL, HuneTec, Kyocera, Lenovo, palmOne, PerComm, 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 http://www.palmsource.com, http://www.palmsource.co.uk, http://www.palmsource.fr, http://www.palmsource.de and http://www.palmsource.com.cn.

Palm OS is a registered trademark and Palm Powered is a trademark of Palm Trademark Holding Company, LLC. Other brands may be trademarks of their respective owners.