Antimalware Engine 1.1.12300.0 was released to customers on 17 Nov 2015

Antimalware Engine 1.1.12300.0 was released to all Windows Defender, Microsoft Security Essentials, Forefront Endpoint Protection, Windows Intune Endpoint Protection, and System Center Endpoint Protection customers on 17 Nov 2015. Signature package 1.211.0.0 is the first that contains this engine.