Topic List

Click a topic to learn more.


Term of the Moment

ECC


Look Up Another Term


Redirected from: Security Essentials

Definition: Microsoft Security Essentials


An anti-malware suite from Microsoft for Windows XP, Vista and 7. Introduced in September 2009, Microsoft Security Essentials (MSE) replaced Microsoft's antivirus subscription service (see Windows Live OneCare) and its Defender antispyware software (see Microsoft Defender). Starting with Windows 8, MSE evolved into Windows Defender, later renamed Microsoft Defender.