Windows Polaris OS

Polaris was a release of Windows Core OS developed by Microsoft, aimed at desktops and laptops. During its development, it was canceled for unknown reasons. As of 2021, only one build of Polaris is currently available.

Development
Polaris was meant to be an operating system based on Windows Core OS, which allowed Microsoft to create more device-specific operating systems without changing too much code. Polaris was meant to be the Windows Core OS based release for desktops and laptops along with Andromeda, which was targeted at phones. The shell would be the Composable Shell (internally known as CShell), which was again based on Microsoft's efforts on bringing Windows 10 to every platform. The Composable Shell would run on composers, which changed the appareance of CShell based on the WCOS release. Polaris would use the Desktop composer. However, development was cancelled soon after with no announcement. The Windows Core OS project didn't get cancelled however, and it would go on to power Windows 10X, which is aimed at laptops and dual-screen PCs.

Builds
As of 2021, only one build of Polaris was currently leaked.