The original version of Windows 11 (also retroactively named version 21H2 and codenamed "Sun Valley") was released in October 2021.
[1][2] It carries the build number 10.0.22000.
[3] It was retroactively named "version 21H2" by Microsoft per its naming conventions that are labeled "YYHX", with YY representing the two-digit year and X representing the half-year of planned release (for example, version 21H2 refers to builds which initially released in the second half of 2021).
[4] The first public preview build was made available to Windows Insiders who opted in to the Dev Channel on June 28, 2021. Notable changes in this version include: The update has reached end of service on October 10, 2023 for Home, Pro, Pro Education and Pro for Workstations editions.
[11] Beta Channel:July 29, 2021 Public release:October 4, 2021 Public release:October 21, 2021 Public release:November 22, 2021