# clm_2104F01B3019

subject: Microsoft (/record/microsoft.md)  
predicate: released  
value: Windows 10, version 21H1  
valid_from: 2021-05-18  
valid_to: null  
published: no source on record carries a date  
recorded: 2026-10-30  
confidence: 0.60  
status: unverified  
assertable: false (unverified: Unverified: one source that is not primary, or a primary source below confidence 0.7. Asserted once a primary source or a second independent domain confirms it.)  
superseded_by: null  
last_updated: 2026-10-31  
cite: AsOf. "Microsoft released: Windows 10, version 21H1", as of 2021-05-18. Claim clm_2104F01B3019, https://asof.is/claim/clm_2104F01B3019, accessed 2026-11-08. Source: https://www.wikidata.org/wiki/Q106909474.  
checked: 2026-10-30 · its source page states the value and the date  

> Windows 10 May 18, 2021 How to get the Windows 10 May 2021 Update By John Cable – Vice President, Product Management, Windows Servicing and Delivery Today marks the beginning of Windows 10, version 21H1 availability.

What https://blogs.windows.com/windowsexperience/2021/05/18/how-to-get-the-windows-10-may-2021-update/ says, word for word.

## Sources

- https://www.wikidata.org/wiki/Q106909474 (secondary, Wikidata)
- https://blogs.windows.com/windowsexperience/2021/05/18/how-to-get-the-windows-10-may-2021-update/ (secondary)

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AsOf is a temporal fact ledger: a structured, dated, sourced record of what is true and what changed, built for AI retrieval.