ipac, did you remember to upgrade your Blackberry Desktop Manager and 7100t Handheld Firmware to 4.0 as I described in my initial post? If so, I'm sorry that it didn't work for you. The 7100t Bluetooth is indeed now working great in my 2005 X5. It rings on the car ringer (and similtaniously on the phone), and I can pick up and drop calls from the steering wheel. I can dial calls from the onboard computer too. However, the address book never loaded as both BMW and Blackberry/T-Mobile said that is still a compatibility problem that they are working to fix. I will say that without the address book loaded into the car's directory, it is much easier to initiate the call from the Blackberry. This is a minor inconvenience; when I scroll to a name on the Blackberry in the address book and click to call that person, without doing anthing further with the Blackberry, the BMW automatically and instantly recognizes the call as soon as I send it and begins working hands-free.