The Microsoft Security Essentials beta is now available for download for Windows XP, Windows Vista, and Windows 7. The build number is 1.0.1407.00.
Full Story: http://arstechnica.com/microsoft/news/2009/06/microsoft-security-essentials-beta-available.ars
Full Story: http://arstechnica.com/microsoft/news/2009/06/microsoft-security-essentials-beta-available.ars