Much-improved interface
Office 2010's interface was beginning to look long in the tooth and a bit dowdy. Office 2013's is much improved, doing away with the sometimes-distracting 3D look of the Ribbon, and adding swaths of flat color. It's far easier on the eyes than earlier versions of Office.
The interface improvements are more than skin deep. The File tab (previously called Backstage) has been revamped, to great effect. For example, when you create a new document now, you get to see thumbnails of available templates. There's a lot more as well, including simple ways to make the Ribbon disappear and then come back when you need it.
More HERE