Windows 8 build 7880

Windows 8 build 7880 is a pre-Milestone 2 build of Windows 8. Images of this build were posted to the BetaWiki Discord server on 2020-06-02, and the build itself was then leaked to BetaArchive on 2020-06-08.

New features

 * Software-rendered Aero.
 * Protogon (later known as ReFS) file system.
 * Winver banner updated to say "Microsoft Confidential" instead of Windows 7.

Immersive features
Immersive Shell and Metro in general has greatly evolved since build 7850. The Metro Horizon has been removed, although a space for it still exists in the start screen, as well as its resources and DirectUI UIFILEs. Tiles now have colors, and right-clicking on a tile shows a menu with several options - "Move to Other View" being among them, although this does nothing when clicked. In fact, all of the options bar the "Open" option (which opens the app without actually entering the desktop) - including such items as "Uninstall" and "Resize" - either do nothing or show an error when clicked. File search has been added, with a different UI to build 7875, although it does not seem to work. The search suggestions in the start screen now use blue text for their first letter. The Blue Screen of Death now supports VBE2 at all times (7850 only supported it during boot) and uses a smooth font - also not covering the entire screen in certain resolutions - but otherwise is identical to Windows 7.

The Windows Runtime has far more classes than in 7850, with more than a dozen WinMD files compared to 7850's one. Pattern logon is available if you set  in   to 1, however there's no option to use it on the login screen.

Arial
This build still uses the Arial font on the watermark and title bars, like in 7867, 7871, 7875, 7878, 7898, 7899, 7900, and 7901.

Aero
This build appears to have a slightly broken Windows Aero theme, with only the top portion of the window frame using the blur effect, leaving the side borders transparent.

Media Center system crash
There's a chance you can encounter a system crash if you open Windows Media Center on this build.