I've got a slightly different problem, although I think it's related.
I've just got a MacbookAir although after so many years with Windows I need to be able to run some Windows XP apps.
I've connected a NokiaE90 phone to my Mac and can use to sync and as a bluetoothmodem, but I'd like that to show through to XP (am currently trialing VMwareFusion) so was assuming I needed to allow the USB host through. When I do this my mighty mouse as above stops working, which is fine, and Windows XP want to install a bluetoothdriver, but can't find anyway to do this and therefore bluetoothdevices not available in VM.
I'm not using a Boot Camp session as I didn't buy a superdrivewith the MBA and installed XP using an image file on my network.
Hope someone can make sense of the above and offer a solution as I can't find an answer on the internet</span>.