Windows 11 is a series of personal computer operating systems produced by Microsoft as part of its Windows NT family of operating systems. It is the successor to Windows 10, and was released to manufacturing on July 15, 2015, and to retail on July 29, 2015. Windows 10 receives new releases on an ongoing basis, which are available at no additional cost to users. Devices in enterprise environments can receive these updates at a slower pace, or use long-term support milestones that only receive critical updates, such as security patches, over their ten-year lifespan of extended support.

Windows 8.1 is a major release of the Windows NT operating system developed by Microsoft. It was released to manufacturing on August 27, 2013, and broadly released for retail sale on October 17, 2013, about a year after the retail release of its predecessor.

The seventh stable build of Windows 10 is called version 1809, known as the October 2018 Update. It was codenamed "Redstone 5" (RS5) during development. This version was released on October 2, 2018.[50] Highlighted features on this build include updates to the clipboard function (including support for clipboard history and syncing with other devices), SwiftKey virtual keyboard, Snip & Sketch, and File Explorer supporting the dark color scheme mode.

Windows 10, version 21H1 is a scoped set of features for select performance improvements, enterprise features, and quality enhancements. As an H1-targeted release, 21H1 is serviced for 18 months from the release date for devices running Windows 10 Enterprise or Windows 10 Education editions.