Having read the threads it does seem a bit too good
to be true.
I had a look at the licence agreement (probably the first
one i've ever read).
It gives Microsoft all sorts of rights over adding, removing and disabling software (and not only viruses and malware).
You might think this is fair enough if all your software
is legit (as is mine), but based on past experiences
with Microsoft products, I wouldn't be at all surprised if
FSX were to be suddenly disabled as 'non genuine'.
Just saying -do you really want to hand over control
of your computer to Microsoft?
(P.S. on the bright side, you can claim up to $5 damages if you win a case under the licence agreement).
The thing with saying MS is so evil and all is that if they wanted to they could do anything to your computer they ever wanted and you'd never know since they already have access to your OS and with it the rest of the computer through these system updates. And denying access to programs by an antivirus program is something that could happen with any antivirus program. The license agreement for any antivirus software has that same liability protection as MS has.