not only its possible you can be 100% truthful to microsoft when you call them to activate and everything will work fine. all theyre going to ask is "how many pc's is this key on?" and you say "one", because it is. its not like your stealing anything, your just using the key on a new machine and microsoft doesnt care that you do, even if they printed the eula to say otherwise. they just dont want one key on multiple machines, thats their real worry.