It sounds too good to be true. The Evil Empire has repented of its ways and is actually giving something for FREE to the IT community from which it has drained so many billions of dollars over the last few decades. Step right up folks and download your free virus scanner guaranteed to totally screw up Norton's and Symantec's cash flow for the next few years until they go out of business.
Oh... and the fine print gives Microsoft the right to harvest and review all of the virus related information on your computer or, with Advanced Membership, possibly even your personal information. Ummm... it looks like they left off the option to choose to send NO information back to Microsoft.
Well, at least they gave it a suitable name - "Microsoft Spynet".
Whoever said there is no truth in advertising?