It's not fake. If you're using hotmail you can tell fake from legit emails by right clicking and choosing "View source". Anybody who's purchased something in the past seems to be getting this email. Everything in the email also fowards to the legitimate
site as well.
The IP address it was sent from is also Microsofts.
"
Registrant:
Microsoft Corporation
Domain Administrator
One Microsoft Way .
Redmond, WA 98052-6399
US
Email: *** Email address is removed for privacy ***"