> Microsofts certification is extremely rigorous, and the second line is already answered: vendors would not get certified, which means they lose the right to display logos and so on, which is IMHO a huge incentive - that is actually what the hardware vendors want - the "sticker". I do not doubt that Microsoft will take any vendor to court if it is caught illegally displaying the logo.
Right. Which is why WHQL and "Microsoft Hardware" are bywords for quality.