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In 8, Microsoft combined MSE & Defender into a single package named Defender.
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Defender was in Windows 7 as an anti-malware software package, whereas Microsoft Security Essentials was the free antivirus package for XP, Vista, and 7. Win8 isn't too bad to use with StartMenu8, and I like to set it up with Microsoft's free Defender antivirus when I work on people's machines.
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