Press Release

PalmSource Names Jeanne Seeley CFO

Industry veteran brings 30 years financial management experience to Company

SUNNYVAYE, Calif. Feb. 28, 2005 — PalmSource, Inc. (NASDAQ: PSRC) provider of Palm OS®, a leading operating system powering next generation phones and mobile devices, today announced it has named Jeanne Seeley the Company's chief financial officer. Seeley reports to David Nagel, PalmSource's chief executive officer, and is responsible for finance, accounting and investor relations.

Seeley, 53, is the former CFO and senior vice president for Snap Appliances, a provider of network attached storage and solutions for the workgroup. While with Snap Appliances, she led the company's spin out from Quantum Corporation and subsequent IPO registration. Prior to Snap Appliances, Seeley was CFO and vice president of Quantum DSS, a storage and storage software company. At Quantum DSS, she was a key member of the team that developed the company's transformation strategy to a global storage solutions company. Seeley was also with Apple Computer for 16 years where she served as vice–president of finance, Corporate Controller and chief accounting officer. Seeley was responsible for global financial operations including: controllership, worldwide planning and forecasting, manufacturing, R&D, sales, marketing and distribution. Before serving as Corporate Controller, Seeley held a variety of financial management positions.

"Jeanne's extensive operational and international management experience in high tech environments make her an excellent addition to the PalmSource management team," said David Nagel, president and CEO of PalmSource. "Her thorough understanding of the critical strategic, tactical and compliance issues within all areas of business operations will help us scale our business as we expand beyond the handheld and smartphone markets into the feature phone market."

Seeley holds degrees in history and education from California State University, with graduate studies in education. She is a board member with the Foothill–DeAnza Community College District.

About PalmSource
PalmSource, Inc. is the company behind Palm OS®, a leading operating system powering mobile information devices. Approximately 38 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 our business. 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 Ms. Seeley to successfully assist us in scaling our business as we expand beyond the handheld and smartphone markets to the feature phone market; realization of the anticipated growth in the feature phone market and our ability to benefit from it; 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.