I have successfully used these instructions to install my Kensington Bluetooth USB dongle (model 33085) on XP SP2 using the MS bluetooth stack. However, when connecting to my Motorola V551 only one service (Dialup networking) is listed for it. The V551 supports OBEX file transfers, bluetooth audio, and digital business card transfers as well. Although I would like to be able to program some Bluetooth apps which interact with my phone, unfortunately I'm going to have to go with the WIDCOMM drivers for their usability. Nonetheless, thanks for the article!