Today we are announcing the beta for the next version of Microsoft Security Essentials. Microsoft Security Essentials was first released in September 2009 and is our award-winning no-cost light weight anti-malware service. It’s designed to help address the ongoing security needs of PCs running genuine Windows – helping keep people protected from viruses, spyware, and other malicious software.

Link – http://windowsteamblog.com/windows/b/bloggingwindows/archive/2010/07/20/beta-for-next-version-of-microsoft-security-essentials-now-available.aspx