Microsoft Security Essentials 简称MSE，开发代号Morro，意思为“小丘”。它是由微软开发的免费杀毒软件，用于防止计算机病毒、间谍软件、恶意软件、Rootkit和木马。它易于安装、使用简单，安静而有效地于后台运行，因而你不必担心会有中断或进行更新。到了Windows8和Win8.1时代，系统直接将这款MSE直接集成到内置的Windows Defender反间谍软件中。
微软免费杀毒软件 v4.9.218 官方简体中文正式版
Microsoft Security Essentials 4.8.204.0 Final
注意：该杀毒软件现不支持Win XP（Win8/Win8.1/Windows10均已内置，无需单独装）
2015年首个正式版，微软MSE 4.7.205 简体中文正式版 ，这个版本支持Windows XP！
离线病毒特征库下载地址：
http://download.microsoft.com/download/DefinitionUpdates/mpam-fe.exe
http://download.microsoft.com/download/DefinitionUpdates/mpam-fex64.exe
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