I maybe a bit behind the times with this but, hey ho, here goes - I had been unable to perform an Activesync between my Z1XSP and a iPaq PocketPC via Bluetooth - looking at this forum and the web in general so were many others.
However, I've just discovered today that I can now do it - the secrect - XP SP2. If you use the XP Bluetooth utilies via the Control Panel you can sucessfully set up a serial connection and Activesync away to your hearts' content.
Sorry if this is already common knowledge but I felt it was worth sharing.
Cheers,
Stephen