THE ITEM THEY ARE SELLING IS NOT THE ONE IN THE PICTURE. It is a white plastic-old style MAC key board, not aluminum one in the picture. I think I will return it.

It works on my Macs and PC's with both XP and Vista. The picture is wrong. It is the old "White" keyboard. The picture is the "Aluminum" The set up on both Macs and PC's was easy. (Easier on the Macs, of course)