Previously, this OS was a separate version of Windows 10, along with Windows 10 Home and Windows 10 Pro. Manufacturers can choose 1 of 3 OS. Now Microsoft releases Windows 10 S as a separate version and converts it into a mode, running on Windows 10 Home or Windows 10 Pro.
This means that the manufacturer can choose one of the two old OS versions, and choose whether or not S mode is turned on by default. Theoretically this makes it easier for manufacturers to access Windows 10 S, users can easily switch to S mode and the Home or Pro version 'has not been unlocked'.
Turning Windows 10 S into mode also helps extend S to computer manufacturers, they can install a copy of Windows and still add 10 S to it. So Microsoft's decision didn't kill Windows 10 S, but it made it easier to popularize.
S mode does not affect the current Windows 10 installation. This means that if you are using Home or Pro, you are not forced to switch to S mode when updating.
Microsoft does not force manufacturers to make S mode the default mode. In fact, it would be cheaper for OEMs to put it on hardware. OEMs are also not required to use S mode, which means that OEM partners such as Dell or HP may continue to sell Windows machines without the S mode.
Microsoft wants them to choose Windows 10 with S mode but doesn't mean they will have to. Windows 10 Home with S mode will be cheaper than no S version but hardware manufacturers can still pay more if they want to leave S mode, and the Pro version too.
This means that you will find many machines with Windows 10 S cheaper. This helps Microsoft bring Windows 10 S to more devices and gives users the opportunity to upgrade without paying extra.
Previously, upgrading from Windows 10 S to 'full version' of Windows 10 will cost you $ 49. The reason is because Windows 10 S is a lower version of Windows 10 Pro, so upgrading is like paying a license fee for the full Pro version.
More convenient in converting and upgrading OS
Now that it has become S mode, upgrading from S mode Windows 10 Pro to Windows 10 Pro without S mode will still cost $ 49, but upgrading from Windows 10 Home in S mode to Windows 10 Home will no charge.
Users will no longer have the pressure to upgrade to the full version immediately. The upgrade from Windows 10 S to Windows 10 Pro is only free for a period of time so many people find it necessary to upgrade immediately. But now Windows 10 Home in S mode upgrade to Windows 10 Home is free so there will be no time pressure.
If you are currently using Windows 10 S then these changes will not affect. You're still running Windows 10 S on your computer, just the OS will be called Windows 10 Pro in S mode, all the benefits of Windows S remain the same.
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