Jornadas use a "real" PC as a mothership. They are syncronized with a Microsoft freeware application called ActiveSync. A nice Wikepedia article explains that the latest version of ActiveSync is not appropriate. The Jornada 720 came out around ActiveSync 3.5, and that version is referred to on the HP Jornada pages. However, ActiveSync 3.8 is the final release of the version 3 host PC sync client for Windows CE based devices and is the recommended version.