Windows Server in the context of "Windows 11"

Microsoft Windows, commonly known as Windows, is a proprietary graphical operating system developed and marketed by Microsoft.

It is grouped into families that cater to particular sectors of the computing industry – Windows for personal computers, Windows Server for servers, and Windows IoT for embedded systems. Windows itself is further grouped into editions that cater to different users – Home for home users, Professional for advanced users, Education for schools, and Enterprise for corporations. Windows is sold both as a consumer retail product and to computer manufacturers, who bundle and distribute it with their systems.

Windows 7 is a major release of the Windows NT operating system developed by Microsoft. It was released to manufacturing on July 22, 2009, and became generally available on October 22, 2009. It is the successor to Windows Vista, released nearly three years earlier. Windows 7's server counterpart, Windows Server 2008 R2, was released at the same time. It sold over 630 million copies before it was succeeded by Windows 8 in October 2012.

Extended support ended on January 14, 2020, over 10 years after the release of Windows 7; the operating system ceased receiving further updates after that date. A paid support program was available for enterprises, providing security updates for Windows 7 for up to three years since the official end of life.

Windows Server 2016 is the eleventh major version of the Windows NT operating system produced by Microsoft to be released under the Windows Server brand name. It was developed alongside Windows 10 and is the successor to the Windows 8.1-based Windows Server 2012 R2. The first early preview version (Technical Preview) became available on October 1, 2014 together with the first technical preview of System Center. Windows Server 2016 was released on September 26, 2016 at Microsoft's Ignite conference and reached general availability on October 12, 2016.

It was succeeded by Windows Server 2019 and the Windows Server Semi-Annual Channel, which was released in 2017. Mainstream support for Windows Server 2016 ended on January 11, 2022, and extended support will end on January 12, 2027.

Windows Server 2019 is the twelfth major version of the Windows NT operating system produced by Microsoft to be released under the Windows Server brand name. It is the second version of the server operating system based on the Windows 10 platform, after Windows Server 2016. It was announced on March 20, 2018 for the first Windows Insider preview release, and was released internationally on October 2, 2018, the same release date of Windows 10 version 1809. It was succeeded by Windows Server 2022 on August 18, 2021.

Mainstream support for Windows Server 2019 ended on January 9, 2024, and extended support will end on January 9, 2029.

Windows Server 2022 is the thirteenth major version of the Windows NT operating system produced by Microsoft to be released under the Windows Server brand name. It was announced at Microsoft's Ignite event from March 2–4, 2021. It was released on August 18, 2021, almost 3 years after Windows Server 2019, and a few months before the Windows 11 operating system.

Windows Server 2022 is based on the "Iron" codebase, unlike Windows 10 21H2, which is based on the "Vibranium" codebase like its predecessor 20H2; this renders the updates between Windows 10 21H2 and Windows Server 2022 incompatible. Like its predecessor, Windows Server 2019, it requires x64 processors.