An Official Microsoft website (http://www.microsoft.eu/) for Europe appears to be having struggles loading and hackers have made claim to this.
— AnonymousSquadNo.035 (@AnonSquadNo035) January 23, 2013
At time of publishing the site was still being slow to load but i can confirm this was down for only a short period of time.
A user with the handle @pronaxx on twitter also announced it was down globally with the following screen cap.
And for those who are concerned this may not be a Microsoft website check the details here.