Microsoft Forefront Microsoft ForeFront是微軟的Microsoft Windows用戶端及伺服器端的一系列保安產品名稱和Microsoft Security Essentials為姊妹軟件 這一系列產品包括了以下各項產品 Microsoft Forefront Client Security舊稱Microsoft Client Protection Microsoft Forefront Security for Exchange Server舊稱Microsoft Antigen for Exchange Microsoft Forefront Security for SharePoint舊稱Antigen for SharePoint Microsoft Forefront Security for Microsoft Office Communications Server舊稱Antigen for Instant Messaging Microsoft Internet Security and Acceleration ISA Server