from
http://msmobiles.com/news.php/1679.html
...
A few hints:
1 - The adapter does not like being plugged into a hub
2 - Can you pair to your PC?
3 - The Bluetooth icon on your PC turns green when you have an active connection.
4 - Double click the BT icon on your PC. Go to View/Modify Config. Then Local services. Note the BT serial port.
5 - Open Activesync on your PC. Go to file/connection settings and make sure the serial com port is the same as in no4 above. If not change it. Make sure the check box is ticked and the port says it is available. If not choose another port in no4 above.
6 - Go to active sync on your phone. Click menu/Connect via BT. (BT must be on of course).
7 - If that does not work, right click the PC´s BT icon, select Quick Connect/BT Serial port. Then after it connects turn BT off then on (phone).
8 - Good luck. BT is a lot of trial and error, but one thing is for sure, it´s a pain is the ...!