I've used ActiveSync successfully on a number of machines and OSs with my HTC phone for a number of years. I've used it both with direct USB connection and with Bluetooth.
On my daughter's notebook, there was no Bluetooth so I bought a Bluetooth dongle - several in fact (a couple of generics and a Belkin)! I'm running Windows 7 on her notebook. Admittedly, none have Windows 7 drivers (where does one get them?) but they install OK and there are no warnings in the Device Manager.
On her notebook, USB ActiveSync works fine. I can pair the phone with the dongle, I can even send files from the notebook to the phone, but even though the Bluetooth is pairing and the phone says that the dongle is providing ActiveSync services, the phone can't authenticate and therefore can't ActiveSync with the notebook.
I'm running the 6.1 Windows based mobile device support.
Any ideas how I can get the phone to authenticate successfully?