Microsoft Security Essentials is the company's newly released, free, real-time consumer antimalware solution.  Microsoft is planning to roll out MSE in an ongoing beta program that will have new private beta builds and a much bigger number of testers.  Microsoft notes that those who are not selected to participate in the beta will have an opportunity to participate in a Customer Preview Program, available next year.  Beta testers will know by November 1, 2009 if they are selected for the MSE Beta Program.