Well even though the original Xbox Live was shut down the gamertags that where never upgraded to 360 stayed. Well looks like they are in the process of being deleted today, a few of my friends where able to change their tags to what they originally wanted. So if there was a tag you want that was on the OG Xbox check today.
Note: Not all tags are gone yet but a few of them seem to be going away.
Note: Not all tags are gone yet but a few of them seem to be going away.