Tom, I'm afraid I don't know you're answer, but I'm curious what MS is. Do you mean MS Office? -- Rich On Jan 21, 2008 6:24 PM, <Technophobic_Tom at comcast.net> wrote: > There are lots of sales for this on eBay right now because users > bought it to get the 2008 for free and then recover some of the $150 > for the Student/Teacher version (the only one I'm interested in). To > get the freebie, buyers have to send in the UPC off the box. The 2004 > license states that it can only be used at one household location. > So, if it has been installed by the original buyer, using one of the > three certificate codes, can they legally sell it? If they haven't > used any of the codes and haven't installed it but have used the UPC > to get the upgrade, can I buy it and then legally install it? How do > those codes work? Are they all unique? When one number is registered, > does MS know what the other two are and thereby can prevent me from > installing it?