Oh well, I believe he gave up on pretending to be a MSN/MS person now (or being assigned by them), as long as he gives up on that everything is fine. No need to bother him any further.
Some guys on the Windows Live Butterflies newsgroup also had convos with him. He doesn't seem to have bad intentions, just a kid trying a little too hard to be helpful. Somebody told him to help people out on the mess.be forums
.