Press Release

Palm Powered Mobile World Continues to Gain Momentum

PalmSource announces new infrastructure partners JP Mobile and MessageVine

CTIA WIRELESS, New Orleans, LA, March 14, 2005 — PalmSource, Inc. (NASDAQ: PSRC), provider of Palm OS®, a leading operating system powering next generation phones and mobile devices today announced two new Palm Powered™ Mobile World infrastructure partners; JP Mobile and MessageVine. Their contributions to the Palm Powered Mobile World program are expected to enhance the user experience of Palm Powered phones and other wireless devices by enabling new wireless services. JP Mobile and MessageVine both provide infrastructure solutions that enable mobile operators to deploy Palm Powered smartphones and wireless devices.

The Palm Powered Mobile World program continues to gain momentum in establishing a wireless ecosystem with the world's leading mobile operators, mobile infrastructure and middleware partners, now with 23 members.

"By working with infrastructure companies, along with middleware and operator companies, PalmSource, through Palm Powered Mobile World, is able to foster a dynamic ecosystem of innovators in the phone and mobile device markets," said Albert Chu, vice president of business development with PalmSource. "Together with our industry leading partners such as JP Mobile and MessageVine, we are furthering the position of Palm OS as one of the most service–ready platform for phones and mobile devices."

JP Mobile
JP Mobile, a leading provider of enterprise mobility software, plans to optimize its flagship product, SureWave Mobile Office, for the Palm OS platform. SureWave is a reliable, easy–to–deploy network–independent push e–mail/PIM solution designed with fully integrated end–to–end security. With SureWave Mobile Office, enterprises can qucikly, easily and securely push e–mail/PIM and group applications to mobile professional using a variety of wireless devices. SureWave Mobile Defense, also from JP Mobile, is designed to be seamlessly integrated with SureWave Mobile Office to provide 100 percent behind–the–firewall server protection, over–the–air encryption and on–device security for complete, end–to–end protection. Both SureWave products can be wirelessly provisioned over–the–air, eliminating the cost and hassle of IT having to manually provision each individual device in use across the enterprise.

MessageVine
MessageVine, a developer of professional instant messaging (IM), presence and real–time communications solutions for the Palm OS platform. Thorough its collaboration with PalmSource, MessageVine will provide IM and presence solutions for the Palm OS platform. MessageVine's solutions is designed to enable users to enjoy always–on, secure real–time communications based on rich presence information, through a friendly and intuitive user interface on their mobile device. The solution, offered to mobile operators, service providers and enterprises, connects consumers and business users to both public and enterprise IM systems.

About Palm Powered Mobile World
The Palm Powered Mobile World program connects mobile operators, infrastructure and middleware partners and software developers in a wireless Palm Powered economy designed to bring Palm OS software applications and solutions to market, provide increased revenue opportunities for partners and a superior experience for users of Palm Powered smartphones. More information on the Palm Powered Mobile World program can be found at www.palmsource.com/partners.

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 related to the benefits of the Palm Powered Mobile World program and the collaboration between PalmSource and members of the Palm Powered™ Mobile World program; the feature, functions and benefits JP Mobile products and MessageVine solutions. 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 the Palm Powered Mobile World program to achieve its objectives and provide the anticipated benefits described; our ability to successfully collaborate with mobile infrastructure and middleware companies, as well as mobile operators, to establish and maintain a wireless ecosystem; the ability of our partners to successfully develop innovative smart mobile devices and innovative Palm OS® solutions for Palm Powered smartphones; our ability to continue to support and grow our developer community to increase the number of applications available for OTA delivery to Palm Powered smartphones; the ability of JP Mobile's software products and MessageVine's products and solutions to perform as described and to provided the the expected results and anticipated benefits; our ability to benefit from any growth in the mobile device market; our ability to compete with existing or new competitors; general economic conditions in the U.S. and abroad 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 Report 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 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. 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, product names, company names, trademarks and service marks are the properties of their respective owners. All rights reserved.