Yes it does. It's called Microsoft Forefront Client Security.
MSE does perform just as good as the other free AVs though the selling point of it is the user interface (which is a set it and forget it style). It also does not demand a lot of resources to run. Another selling point is that it offers a white list that is much easier to use (i.e. if it detects a trainer as a virus, you can tell MSE to allow the program to run upon detection).
Then again AV's tend to lag behind the virus curve as no AV can protect fully against a zero day virus attack.
This guide = Better chance not getting a virus in the first place (and you don't argue with R1CH...he's the Wizard):
[Edited by moderator Neo7, 12/2/2010 10:50:44 AM]
I have Symantec Endpoint Protection 12 on my Vista O.S and Kaspersky Internet Security 2011 on my 7 O.S.
i use MSE in combination with other utilities/browser add-ons to keep my computer safe and clean
though the best defense against viruses is YOU, knowing what sites not to visit, what things you shouldn't attempt to download, and what emails you shouldn't open, though more often than not you'll have to learn them the hard way