It is supposed to be compatible, However it seems to be very hit and
miss as to whether or not it will work for you. From what I have learnt
it seems that often peoples usb ports cant pump out enough power to make
it work.
Vista will find the wireless reciever without any problems 100% of the
time, however as soon as you try and connect a controller you will
either be one of the lucky ones or tearing your hair out in frustration
as vista trys to install software that it cant fins or simply wont
recognise. (I talk from experience) Oh and microsofts answer is simply
that it works and if it doesnt then thats not their fault but
yours.
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Hoppers