The problem is, he uses this NIC as part of his toolkit, to work on systems, and it works on all OSes but Vista. It's just crazy that it's not supported in Vista.
I also had someone complain to me that their recently-purchased Linksys 10/100 PCI card didn't work in Vista. I was trying to sell him another card, which I assumed worked in Vista (what NICs would work in XP, but not in Vista?), but I decided not to, as the box didn't have the Vista logo on it. For all I know, it probably does NOT work in Vista. It seems that is the case for plenty of existing hardware, for no good reason I might add.