How to replace the Microsoft Bluetooth Stack?

[mmo]

Shortly after I had gotten my T60p I removed the Lenovo BT stack and switched to the bluetooth stack that comes with Win XP (the initial lenovo stack had some problems: only very seldomly did it recognize my PDA and even then it constantly dropped connections. It was really tedious). The XP "standard" stack was much more reliable.

Recently a colleague mentioned that he is very happy with one of the later versions of the lenovo BT stack and since that stack seems to have much more profiles than the standard stack I wanted to give it a try again.

So, I disabled the BT device (Fn F5), uninstalled the existing BT devices (MS' BT driver and BT Enumerator), removed all virtual BT COM ports and disabled the MS' "Bluetooth support service".

Then I installed the most recent BT stack, rebooted an then enabled the BT device again. The HW manager detected the "new" device, installed all drivers and now signals, that it is using the newly installed BT driver ("Thinkpad Bluetooth with Enhanced Data Rate" V5.1.0.2100), but the Bluetooth Configuration in Control Panel reports "Bluetooth Device Is Not Detected" (Diagnostics Tab), the task bar icons is red and thus also signalling "no device", and "Bluetooth Places" on the desktop reports the same.

What else do I need to disable, change or fiddle with so that the MS stack is removed and the Lenovo stack (and its profiles) are able to connect and use the BT device?

Michael