Windows 10 build 18977

Windows 10 build 18977 is an unleaked build of Windows 10 May 2020 Update. It was showcased in the session "MSIX app attach: The future of app delivery in virtual environments" at the Microsoft Ignite 2019 conference, as well as in the video "Building apps for Windows 10 Desktops and expanding reach w/ Windows Virtual Desktop" uploaded on YouTube by Microsoft 365 Developer on 19 May 2020.