I have actually tried with two other WM5 devices and none will sync via Bluetooth and all sync via USB. All also sync with Bluetooth on my XP Laptop no problem and I am using the exact same Belkin Bluetooth dongle and drive vesion on both the Vista and XP boxes.
Afte some research, I found that there is definately a bug in Vista. I found this (
http://www.microsoft.com/windowsmobi...eshooting.mspx) go down to "The Motorola Q phone cannot...." and try what they tell you. I tried, but it didn't work either. It looks like the Microsoft Bluetooth stack does not have an ActiveSync service.