Press Release

Motricity Selects PalmSource Installer to Power Web and OTA Delivery of Palm OS Applications

Over–The–Air download and install now available for Palm OS applications with one touch of a button

San Jose, California, PalmSource Mobile Summit and Developer Conference, May 24, 2005 — PalmSource, Inc. (NASDAQ: PSRC), provider of Palm OS®, a leading operating system powering next generation mobile devices and smartphones, announced today that Motricity, a premier provider of mobile content to consumers, is adopting the PalmSourceÔ Installer 1.5 as its preferred technology for the web and over–the–air (OTA) delivery of Palm OS applications to Palm Powered™ devices. Motricity user interfaces will be enhanced with the PalmSource Installer's easy one–touch software download and install functionality, which is designed to further boost the adoption of wireless Palm OS applications and provide enhanced user experience.

PalmSource Installer is a core component of the Palm OS® platform that makes it easier for Palm OS users to discover and take advantage of third party Palm OS applications by simplifying the downloading and installation of applications over–the–air and via PalmSource™ Desktop HotSync® technology anywhere you go.

With just a single click from a mobile device or desktop browser, PalmSource Installer automatically chooses the correct variants of an application to download and install on any Palm Powered™ mobile device. It makes intelligent choices by detecting a user's device requirements, based upon memory, screen resolution, default language, version of the operating system and device type.

The PalmSource Installer bridges the gap between desktop and wireless application installation, allowing applications installed wirelessly to automatically install any desktop components needed on the PC during the next PalmSource synchronization operation. This capability is unique to the PalmSource Installer, and provides for a user experience that is unrivaled in power and simplicity.

"We chose to support PalmSource Installer because it is a solid solution that eliminates barriers in the customer's Palm installation process," said Ryan Wuerch, chairman and chief executive officer at Motricity. "The ability to download and install software with one click will provide a greatly enhanced application experience for customers, which in turn will result in increased business for us and our third–party developer partners."

Motricity has committed to support the PalmSource Installer format and will promote the distribution of Palm OS applications in the Installer format within its OTA and Web platforms, including the PalmSource Software Store (palmsource.palmgear.com) and the PalmGear.com store (www.palmgear.com).

"Motricity is the first major provider of mobile content and applications to fully embrace the PalmSource Installer and bring these advantages to customers," said David Nagel, president and CEO of PalmSource, Inc. "We believe that the PalmSource Installer will substantially broaden the reach of Palm OS® applications by creating a compelling user experience in a world which is becoming increasingly wireless."

PalmSource Installer 1.5 key features:

The PalmSource Installer 1.5 is designed to support the current installed base, is backwards–compatible with Palm OS 4.0 and runs both on Palm OS Garnet and Palm OS Cobalt.

  • Self–extracting EXE creation for simplified Windows install
  • Self–extracting PRC support for Macintosh/Linux installation
  • "Universal" URL supports OTA and desktop from one link
  • "Universal" browser support: IE, Firefox, Mozilla, Netscape, Opera
  • Installation support for operating system selection and device ID selection (in addition to language and screen resolution)
  • Auto–Run of app after install
  • Simple documentation install ("Installed Packages" Directory)
  • Improved graphics/icons
  • Updated documentation and samples

The PalmSource Installer is immediately available to PalmSource registered software developers and is free of charge.

To see what the PalmSource Installer 1.5 is capable of, visit www.palmsource.com/installer.

About Motricity
Motricity is the premier provider of mobile content to consumers, uniquely powering over 120 million mobile subscribers with its market–leading Fuel mobile content delivery platform through global partners such as Cingular Wireless, Verizon Wireless, China Unicom, mmO2, Amazon.com, palmOne and many others. With a catalog of more than 500,000 mobile titles, the company is also one of the world's largest providers of mobile content through its network of consumer websites and channel partnerships, reaching over 10 million consumers worldwide. From games to business applications, and from ringtones to eBooks, Motricity powers the entire spectrum of mobile content delivery solutions for consumers and business partners. Motricity is headquartered in Research Triangle Park, NC, with offices in Munich, London, Beijing and San Francisco. For more information, please visit www.motricity.com.

About PalmSource
PalmSource, Inc., the company behind Palm OS®, a leading operating system powering smart mobile devices, is a leading developer of software for mobile phones and other mobile devices. Its products include a wide range of software for mobile phones at all price points. More than 39 million mobile phones, handhelds, and other mobile devices run PalmSource software. More than 45 companies worldwide have licenses to PalmSource software, including Fossil, Garmin, GSPDA, Kyocera, Lenovo, palmOne, Samsung, Sony, and Symbol Technologies. 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.

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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 the features, functions and benefits of PalmSource™ Installer 1.5 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 PalmSource Installer 1.5 to perform as described and to provide the anticipated benefits including, without limitation, its ability to enhance the Motiricity user interfaces, to boost the adoption of wireless Palm OS applications, to provide an enhanced user experience, and to increase business for Motricity and its third party development partners; our ability to grow and maintain our developer community and to compete with existing and new competitorsand 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, November 26, 2004, and February 25, 2005. 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, HotSync 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.