
What is actually Windows 10 “S”?
Windows 10 S is a fully-fledged version of Windows 10 designed for low-cost computers as well as education-oriented PCs and even some premium computers, such as the new Microsoft Surface Laptop.

Google Chrome has become so good that when it comes to affordable, quality laptops, it’s a better buy than a cheap Windows device. So Microsoft needs a lightweight OS to compete, and it’s really hoping that the education-focused Windows 10 S will be that OS.
It’s meant to be cheaper and less processor intensive than Windows 10 Home or Pro, the versions of the OS found on most laptops and desktops today.
What does the ‘S’ stand for?

According to Microsoft the “S” doesn’t stand for anything in particular, but the company says Windows 10 S is streamlined for simplicity, security and speed.
Windows 10 S will boot 15 seconds faster than a comparable machine running Windows 10 Pro with the same profile and apps installed, and it will run as fast on day 1,000 as it does on day one, Microsoft Officials says.
What makes this lightweight?
There are far fewer programs running in the background. According to Microsoft, a laptop running Windows 10 S loads a user profile (including apps and preferences) 15 seconds faster than an identical laptop running Windows 10 Pro.
What if I have Windows 10 S and need to run apps outside of the Windows Store?

Any Windows 10 S machine can be upgraded to Windows 10 Home for a one-time fee of $49. Some machines, such as Microsoft’s Surface Laptop, will also come with a free upgrade to Windows 10 Pro for a limited period.
Once upgraded to Windows 10 Pro, it is not possible to revert back to Windows 10 S.
What systems will it be available on?
