Press Release

Qualphone Joins Palm Powered Mobile World

Company to Bring Push–to–Talk Solution to Palm Powered Phones and Mobile Devices

3GSM WORLD CONGRESS, CANNES, France, Feb. 14, 2005 — PalmSource, Inc. (NASDAQ: PSRC), provider of Palm OS®, a leading operating system powering next generation phones and mobile devices, today announced Qualphone, a company focused on developing high–quality voice and multi media software solutions for smartphones and mobile devices, has joined the Palm Powered™ Mobile World program.

In this first phase of the collaboration, Qualphone will work together with PalmSource to port Qualphone's Push to talk over Cellular (PoC) client to the Palm OS® platform. Together with Palm OS, the solution is designed to provide users with an easy–to–use and reliable push–to–talk experience on Palm Powered phones and mobile devices. Qualphone's Push–to–talk over Cellular (PoC) client is certified to meet the end–to–end interoperability standards of Nokia's back–end infrastructure, enabling PalmSource to leverage mobile operator networks worldwide that have standardized their mobile services offerings based on Qualphone's technology.

In addition to a PoC client, Qualphone offers an IP Multimedia Subsystem (IMS) mobile client reference design to enable the creation of multimedia services that meet mobile operator network requirements. In the future, Qualphone plans to collaborate with PalmSource to optimize Qualphone's IMS offering for Palm OS, providing users with new mobile information, communication and entertainment offerings that take advantage of the advanced functionality of Palm Powered mobile devices.

"We are very pleased to join the Palm Powered Mobile World program and offer our technical expertise in enabling interactive multi media services for mobile products in an effort to enhance the user experience of Palm Powered phones and mobile devices worldwide," said Isaac Eteminan, CEO of Qualphone.

"Our partnership with industry–leading partners, such as Qualphone, reinforces PalmSource's commitment to make Palm OS the most service–ready platform for the creation of phones and mobile devices," said David Nagel president and CEO of PalmSource, Inc. "We look forward to forging new relationships with leading mobile operators, infrastructure partners and software developers in order to drive innovation and differentiation in the global phone and mobile device markets."

About Palm Powered Mobile World
Launched in the Fall of 2003, Palm Powered Mobile World is designed to connect mobile operators, infrastructure providers and software developers to efficiently bring Palm OS software applications and solutions to market, providing increased revenue opportunities and a superior user experience for Palm Powered smart mobile devices. More information on the Palm Powered Mobile World program can be found at www.palmsource.com/operators.

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.

About Qualphone
Qualphone is a leading provider of interoperable mobile embedded 3G/IP Multimedia Sub–system (IMS) client solutions and services. The company's suite of solutions is highly scalable accelerating the deployment of 3G/IP multimedia based solutions. Qualphone is a global company headquartered in San Diego, California. For more information about Qualphone, please visit the company's web site located at: www.qualphone.com.

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 collaboration with Qualphone; the port of Qualphone's Push to talk over Cellular (POC) client to the Palm OS platform; and the Palm Powered Mobile World program. 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, our ability to collaborate successfully with Qualphone and other Palm Powered Mobile World partners; the ability of Qualphone to successfully port the POC client to the Palm OS platform and to optimize its IMS offering for Palm OS; our ability to successfully leverage mobile operator networks using Qualphone's technology; our ability to enter into new relationships with leading mobile operators, infrastructure partners and software developers to create innovation and differentiation in the global phone an mobile device markets; realization of the anticipated benefits of the Palm Powered Mobile World program; 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, 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.