Daft question, but with Active 4.1 why do you need Bluetooth in the picture? I believe that Microsoft crippled Win Mobile 5 and ActiveSync 4.0/4.1 so that for full synchronisation, that you have to do it on the cradle, via USB.
I find ActiveSync 4.0/4.1 a PIA really. Had a nightmare getting it to work initially, but now that it does, I leave it well alone until somebody brings out a more friendly piece of software. I think it is the weakest part of the Win M5 equation.
Conan