[WindowsCentral.com]

Here's exactly what Windows 10 S is, how it works, how to upgrade the OS to Windows Pro, and details on how you can then downgrade if you want to.
The new Surface Laptop ships with Windows 10 S, a variant of the Windows 10 Pro OS with one caveat: it only runs Windows Store apps. We've written a lot on Windows 10 S already including detailed a hands-on, and we explained why Windows 10 S is the right move for education – and eventually for consumers.
Today, I want to highlight a few things you may not know about Windows 10 S, how it works, what's unique about it, and how upgrading to Pro works.

Full story from the WindowsCentral blog...