Hey guys, was just hoping for a bit of clarification. Are the OEM COA keys printed on store bought machines able to be used on any machine? Or are they such that when they are used, you have to phone MS, regardless of what machine it's used on? Given that the second option seems most likely, surely if you were so inclined, you could just jot down all the COA keys you come across in day to day life, and there you have it... infinite keys. (with the very slim chance that the key could be used on the original machine) This is all hypothetical... purely academic I assure you.