Microsoft Security Essentials is now available. Formerly codenamed Morro, this replacement for OneCare is free and sounds like it could be a genuine threat to commercial anti-malware.

Microsoft will block users running counterfeit copies of Windows from installing the free Security Essentials antivirus software, the head of the company's anti-piracy group said Tuesday.

Microsoft Security Essentials (MSE), offers Windows users a comprehensive antimalware scanner for users running Windows XP SP2, Vista or the upcoming Windows 7, which is scheduled for release at ...

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