Windows 10X

Windows 10X is a canceled version of Windows 10 that was intended for both single-screen and dual-screen tablets. It is based on Windows Core OS, in a similar fashion to the cancelled Polaris project. Development of the operating system was halted in February 2021 and then later canceled, with some key technologies being incorporated to desktop Windows and other products. . Several of its major UI features were later ported to Windows 11.

The operating system features a new GUI stack using DirectX and UWP. Although it still contains the Win32 subsystem, the base system does not include the old USER/GDI stack and legacy Win32 apps have to run virtualized, either using remoting or a purpose-built container.