[zoombini]

To save your friend giving you his CC details, you could get him to recover his GT onto your box (I think it asks for the last 4 digits of the CC when doing this) and that way you will not know these details.

However, when its nearer time to renew, he will have to make the account be cancelled otherwise he will be charged again. He cannot get them to mark it up as finishing at the end of the contract (MS's crappy software).

As far as MS are concerned, they will see that its being used on another box, as if he maybe got a new one. The location is immaterial, esp if the details are correct.