Skip Jawbone if you want to use this on XP (or will want to make Skype/SIP/VoIP calls on XP). Even XP SP2 doesn't support Bluetooth headsets, and Jawbone has elected not to do what most other manufacturers do (license and release the third-party Widcomm driver).

So it won't work on XP; Jawbone support says "We do not have an XP SP2 Widcomm Bluetooth driver available as we do not support PC/MAC compatibility at this time."

No good or bad blame, just info that you should know before buying.