The statement quoted in many forums is not true.
As we have been saying since day one, Microsoft Windows AntiSpyware will be available at no charge to licensed users of Windows. Users who validate their Windows install through WGA will be allowed to download the AntiSpyware beta, as well as the full standalone version of AntiSpyware when it releases to the web."
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Well, that should sooth any worry about Microsoft AntiSpyware being free or not. The cost of it is just a legal copy of Windows.