Windows 11

Windows 11 is the successor to Windows 10, which was introduced in 2015. It is a significant release of the Windows NT operating system produced by Microsoft and announced on June 24, 2021. On October 5, 2021, Windows 11 was made available to the general public as a free update via Windows Update and Windows 11 Installation Assistant on qualified Windows 10 devices.

Build 21380
A very early build of Windows 11 that was seen running on an Acer Aspire Vero prototype.

Build 21996
The earliest accessible build of Windows 11, leaked on June 15, 2021.

It is currently the earliest available build to replace the older flag first introduced in Windows 8 with a new flat design; however, the old design is still present in certain areas presented within the build.