Antivirus protection without Defender for Endpoint Windows Defender is also offered for consumer devices on Windows 8.1, although Windows Defender does not provide enterprise-level management. In Windows 8.1, enterprise-level endpoint antivirus protection is offered as System Center Endpoint Protection, which is managed through Microsoft Endpoint Configuration Manager. Microsoft Defender Antivirus is only available on devices running Windows 10 and 11, Windows Server 2022, Windows Server 2019, Windows Server, version 1803 or newer, Windows Server 2016, and Windows Server 2012 R2.