Press Release

PalmSource Appoints Betsy Rafael to its Board of Directors

SUNNYVALE, Calif., April 29, 2004 — PalmSource, Inc. (NASDAQ: PSRC) provider of Palm OS™, a leading operating system powering next generation mobile devices and smartphones, today announced the appointment of Betsy Rafael to the PalmSource board of directors. Rafael currently serves as vice president, corporate controller and principal accounting officer at Cisco Systems, Inc.

Rafael brings 18 years of finance and operations experience at small and large high-tech companies. Before joining Cisco, she held the positions of chief financial officer and executive vice president of finance at Aspect Communications, overseeing the company's financial, legal, manufacturing, IT and facilities operations. Prior to her position with Aspect, Rafael served as senior vice president and CFO at Escalate, a private e-commerce applications service provider. Rafael has held management positions at Apple, Ernst & Young, SGI and Sun, received a bachelor's degree in accounting from Santa Clara University and is a certified public accountant.

"Betsy adds to the financial strength of our board of directors and complements the board's economic, business and industry knowledge," said David Nagel, president and chief executive officer, PalmSource. "Her extensive experience in accounting, finance, investor relations and corporate governance is a welcome addition and strengthens the diversity of the PalmSource board."

Rafael joins PalmSource board members Eric Benhamou, John B. Shoven, Satjiv S. Chahil, Robert Finocchio, Jean-Louis Gassﾃｩe, David Nagel and P. Howard Edelstein.

About PalmSource
PalmSource, Inc. is the company behind Palm OS, a leading operating system powering mobile information devices. Approximately 33 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 www.palmsource.com, www.palmsource.co.uk, www.palmsource.fr, www.palmsource.de and www.palmsource.com.cn.

Palm, Palm OS, PalmSource are trademarks of Palm Trademark Holding Company, LLC.