He's probably not that mad. I swapped "Y G" didn't think know you couldn't swap if there was a V1 version,
I mean I was mad at first but I got over it when I realised it was just a fucking gamertag. (Even though could of got a couple nice bucks from it)
I told this one kid about it, and he told EVERYONE. Lol, I literally got like 20 messages on AIM of people cursing at me. They were the ones mad.
EDIT: @Zune, they forgot to tell you about the part where it could take up to 7 years for the gamertag to become available again.