English, Bulgarian, Chinese (Simplified), Chinese (Traditional), Croatian, Czech, Danish, Dutch, Estonian, Finnish, French, German, Greek, Hungarian, Italian, Japanese, Korean, Latvian, Lithuanian, Norwegian, Polish, Portuguese (Brazilian), Portuguese (Portugal), Romanian, Russian, Serbian (Latin), Slovak, Spanish, Swedish, Thai, Turkish, Ukrainian and Vietnamese 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.Before version 4.5, MSE ran on , Windows Vista and Windows 7, but not on Windows 8 and later, which have built-in AV components. The license agreement allows home users and small businesses to install and use the product free of charge.Sixteen months after the release of version 2.0, Microsoft skipped version 3.0 and released Microsoft Security Essentials 4.0.A public beta program started on 18 November 2011, when Microsoft sent out invitations to potential participants without announcing a version number.
Version 2.0 integrates with Internet Explorer to protect users against web-based threats.
On 15 September, Windows 8 developer's blog confirmed that Windows Defender in Windows 8 would take over the role of virus protection.
In an included video, Jason Garms of Microsoft showed how Windows Defender is registered with Action Center as an AV and spyware protection tool, and how it blocks drive-by malware.
It disables detected threats and prompts for user input on how to deal with them.
If no response is received within ten minutes, suspected threats are handled according to the default actions defined in the application's settings.