

In March 2019, Microsoft announced Microsoft Defender ATP for Mac for business customers to protect their Mac devices from attacks on a corporate network, and a year later, to expand protection for mobile devices, it announced Microsoft Defender ATP for Android and iOS devices, which incorporates Microsoft SmartScreen, a firewall, and malware scanning. It has evolved into a full antivirus program, replacing Microsoft Security Essentials in Windows 8 or later versions.

It was first released as a downloadable free anti-spyware program for Windows XP and was shipped with Windows Vista and Windows 7.

Microsoft Defender Antivirus (formerly Windows Defender) is an antivirus software component of Microsoft Windows.
