Sounds phoney - have a look here and see if any matches:
http://www.hoax-slayer.com/search.php?zoom_que ry=microsoft
It may sadly be worth your while getting a new email address, and using it only for private business - use your old one as a 'dirty' account.
The ISPs often try hard but the scammers are so energetic they could light up Liverpool with their efforts.
Don't try and take on the scammers, just pay them no attention and make a practice of keeping your identity secret online eg when sites demand an email address, they often accept any old nonsense with an '@' sign in it eg
[email protected]