Vista RTM has been released without support for Bluetooth (BT) headset devices – at least this is what I know and my Motorola BT headset was not properly installed with Vista. This is a little odd as in some earlier beta and RC this option was available.
Yesterday one of my friends from our Microsoft sub informed me that update which allows support for headset devices on BT for Vista is available on Microsoft Update. What You need to do is to connect Your BT device and let Vista look for the driver (see image below).
Result .. my Motorola H3 headset was installed correctly and I can use it now in Vista like any other device.