Antimalware Engine 1.1.10201.0 was released to customers on 16 December 2013

Antimalware Engine 1.1.10201.0 was released to all Microsoft Security Essentials, Forefront Client Security, Forefront Endpoint Protection, Windows Intune Endpoint Protection, and Windows System Center Endpoint Protection customers on 16 December 2013. Signature package 1.165.0.0 is the first that contains this engine.