http://www.washingtonpost.com/blogs/the-switch/wp/2018/03/07/microsofts-changing-its-windows-10-s-operating-system-into-s-mode/

Less than a year after introducing Microsoft Windows 10 S, a lightweight version of Microsoft's operating system marketed to students and businesses, the company is now folding the separate systems's main features into every version of Windows.

Windows 10 S will now become “S mode” in Windows 10 Home, Windows Pro PC and Windows 10 Enterprise, according to a Wednesday blog post from Microsoft corporate vice president Joe Belfiore. The change is prompted, in part, by feedback that having so many versions of Windows was confusing, Belfiore said.