Microsoft's announcement of its own AV software on 18 November 2008, was met with mixed reactions from the AV industry. It lacks the OneCare personal firewall and the Forefront Endpoint Protection centralized management features. It replaces Windows Live OneCare, a discontinued commercial subscription-based AV service, and the free Windows Defender, which only protected users from spyware until Windows 8.īuilt upon the same scanning engine and virus definitions as other Microsoft antivirus products, it provides real-time protection, constantly monitoring activities on the computer, scanning new files as they are created or downloaded, and disabling detected threats. The license agreement allows home users and small businesses to install and use the product free of charge. MSE 4.5 and later versions do not run on Windows XP.

Prior to version 4.5, MSE ran on Windows XP, Windows Vista, and Windows 7, but not on Windows 8 and later versions, which have built-in AV components known as Windows Defender. Microsoft Security Essentials ( MSE) is an antivirus software (AV) product that provides protection against different types of malicious software, such as computer viruses, spyware, rootkits, and Trojan horses.

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Windows security essentials