21H2

The abbreviation 21H2, meaning the second half of 2021 in the Microsoft semester scheme, can refer to the Cobalt semester or multiple Microsoft Windows releases:

• Windows Server 2022 (build 20348), released on 18 August 2021
• Windows 11 (build 22000), released on 5 October 2021
• Windows 10 November 2021 Update (build 19044), released on 16 November 2021

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