Microsoft announces Windows 10 S – a version of Windows 10 Pro that is, in Microsoft’s words, “optimized for security and performance”. It does this by working only with apps from the Windows Store and having Edge as its default browser. You can pay to upgrade to Microsoft Windows 10 Pro through the Windows Store at any time, but you can’t then go back to Windows 10 S.
To find out more about Microsoft Windows 10 S, please visit the FAQ page: https://support.microsoft.com/en-us/help/4020089/windows-10-s-faq
