Windows 10 S mode is Microsofts new secure platform. Its goal is to provide the familiar Windows 10 interface with a much more restricted software deployment process. Windows S mode provides support for Windows Hello for authentication, Cortana for search, Windows Ink and Microsoft Edge. Microsoft has a version of Office that you can deploy to Windows S devices either using an Office OEM Preinstall Kit (OPK) or using the Office that can be purchased through the Microsoft Store. Microsoft Office is available for Windows S Mode via the Windows Store.”]
Source: https://www.csoonline.com/article/3274467/microsoft-locks-down-windows-10-with-the-s-edition.html