The version 4.10.209 of Microsoft Security Essentials Prerelease is provided as a free download on our website. This download was scanned by our antivirus and was found as virus free. Microsoft Security Essentials Prerelease relates to Security. The most popular versions of the software is 4.10.209. This free software is an intellectual property of MicrosoftPrerelease version of Microsoft Security Essentials lets you run the latest version of this anti-malware program. After installing this application, you will be enrolled in the Microsoft Error Reporting, Customer Experience Improvement Program, and Microsoft Active Protection Service. Your feedback would be used to make improvements in it.