Clicking the File tab opens the File menu, also known as Backstage view. Backstage View provides access to commands that have to do with the data file you are working with — things like saving, opening, printing, mailing and checking its properties. The File tab is a different color in each application. In Word, for example, it is blue. To leave Backstage view, click some other tab or press the Esc key.
When you open Backstage View, the Info category appears. It provides information about the current document, and offers commands for protecting the document, checking for issues and managing versions. In addition, if the document uses a different file format than Word 2010, a Convert button appears, enabling you to upgrade the document format.
Some of the other categories, when selected, make additional commands or options appear to the right of the list.
The bottom-most command in the list is Exit, which quits the application. Directly above it is an Options button, which opens a dialog box from which you can control the settings for the application.