I use a Vebatim 96674 Bluetooth laser mouse with my T510-CTO laptop, with latest Bluetooh drivers installed on 64-bit Win 7 Pro . It generally works fine, but randomly, on average a couple of times a day, it stops working; no cursor movement, no response to mouse buttons. I have not been able to correlate the quits with any particular actions.
Turning the Bluetooth radio off and on, turning the mouse off and on, and presing the mouse's connect button do not restore it. Here's the really strange part: navigating to the Mouse control panel applet and opening it with the TrackPoint DOES restore the mouse. I don't even have to click anything in the applet window; it just starts working again.
Bluetooth is effectively an USB device, and often can be affected by power management settings elsewhere in the system. Uncheck the "allow Windows to turn device off to save power" in the properties of the USB root hubs and the Thinkpad Bluetooth 2.1 with Enhanced Data Rate II radio driver in device manager .