I have a W510 complete with a Thinkpad bluetooth mouse. I have gone through the process of linking them both and it works for a short while, then the connection fails and I have to go through the process again. I have recently had my Windows Ultimate upgraded to 64bit.
The following steps have been reported to improve the pairing of the mouse and system on a sustained basis.
Go to device manager (under my computer)
Open 'Bluetooth radios'
Right click on 'bluetooth module' (NOT enumerator)
Go to 'power management' tab
Uncheck the 'allow computer to shut device off to save power' box