Windows 10 build 18991

10.0.18991.1000
Build of Windows 10 May 2020 Update
OS familyWindows 10 (NT 10.0)
Version number10.0
Build number18991
Build revision1000

Windows 10 build 18991 is an unleaked build of Windows 10 May 2020 Update. An issue related to this build was posted to GitHub by different Microsoft employees on 25 September 2019.[1]

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