Windows 8 unidentified May 2011 build

On 1 June 2011, several days before Windows 8 was revealed to the general public at All Things Digital (D9) and in the lead-up to the public release of the Windows Developer Preview, an internal Microsoft video was recorded which showed off an unknown 80xx UEX build, which featured significant UI changes that would eventually be reverse-integrated into mainline Windows branches during the course of several months between May and August.

The video demonstrating the build in question was publicly released on 16 October 2022 in issue 102 of former Windows division president Steven Sinofsky's account of events during their time at Microsoft, titled Hardcore Software, 11 years and 4 months after the footage was recorded.

Observations
TODO: work on adding observations here As previously mentioned, various user interface changes observed in this build would eventually be merged into mainline Windows branches from May through August 2011. A newer variation of the Windows Aero theme is used in this build coupled with the updated Segoe UI font (which would later appear in build 8133), although the former would not be utilized in mainline builds until around build 8008. The Charms bar seen in various sections of the video appears to be identical to the one seen in the official Developer Preview build.