Antimalware Engine 1.1.8101.0 was released to customers on 20 Feb 2012
Antimalware Engine 1.1.8101.0 is released to all Microsoft Security Essentials and Forefront Client Security, Forefront Endpoint Protection, Windows Intune Endpoint Protection customers on 20 Feb 2012. Signature package 1.121.0.0 is the first that contains this engine.