In Windows 10, all applications from PCs to smartphones and game consoles run on the common platform "Universal Windows Platform (UWP)"
Editing screen in Word for iPhone. Optimized for small screens, including a simple edit mode for editing text and a viewing mode for previewing."Universal" version Excel in Office is optimized for touchscreens and works on PCs and smartphones alike. (As of May 2015, Japanese input is not supported yet)
Another Office application "Office 2016"