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Report says Security Essentials is most popular due to offering via Windows Update



From DailyTech:
A new report from OPSWAT has been published and it shows that the free version of the Microsoft Security Essentials is the most widely used antivirus software in the world. The latest version of Microsoft Security Essentials was released at the end of 2010.

Microsoft notes that the free security software has been downloaded 30 million times so far.
  Microsoft Security Essentials is Most Used AV Protection in North America