Your unit shipped with AS3.7.1, but AS3.8 (last 3.x build) should work fine. AS4.x is generally faster, better; I use it and it always works fine (as it apparently does for you). Many Axim users have reported all manner of frustrating minor bugs that do not occur when running AS3.x. I would recommend ActiveSync over Vista's Sync any day; the latter is slow and unreliable, particularly when older (pre-WM6) devices are connected. (Don't expect Microsoft to improve it; their focus will always be on ensuring that the newest/greatest toys work well, not the discontinued obsolete toys that no longer generate revenue.) Note that I prefer porting data manually (through flash cards) and generally avoid using sync software, and that I don't tend to run any WM software that's known to cause sync issues (the problems that do occur largely seem to involve compatibility bugs with specific software titles/versions, plus a generous mix of the usual PC/Windows/PICNIC issues that I'm confident you will be able to circumvent). The current version of Microsoft ActiveSync (4.5) can be downloaded here, older versions (including 3.7.1 and 3.8) can be found here.