worlds apart, ms stack = uranius (or sounds like); widcomm = earth (before man polluted it)
Check benot's link. And no, I don't believe it will harm your system otherwise those two guys responsible would be dead right now (just kidding B and M). The hack is fully installable and uninstallable. Thank you beemer and mikelspikel.
Heres a summary:
Compared to the X51's bluetooth stack
A superior bluetooth manager
A bluetooth services manager
Personal Area Networking
A2DP profile
Audio Gateway
HFP
Configurable baud / flow rate / com port
A more reliable obex file transfer
as compared to the pathetic bluetooth service manager of the X51