InformationWeek's article has the details. The interesting bit in my view:  The switch was not a surprise, given PalmSource's focus on supplying an OS for advanced cellular phones, called "smartphones," that contain many of the same features as PDAs, such as contact lists, personal calendars and email. Given my experience with the SPV C500 (a Microsoft SmartPhone), I don't think PalmSource's change of focus will help in the long run...