introduced the Microsoft
Office Button which replaced the file menu in earlier
versions of Microsoft Office. Howerever, there were some that found this
confusing and counterintuitive. Therefore, Microsoft decided to replace the
Microsoft office Button with the File tab.
Now when you click on the File tab you
are sent to the Microsoft Office Backstage view. The
Backstage view is where you manage your documents and related data about those
documents - create, save, and send documents, inspect documents for hidden
metadata or personal information, set options such as turning on or off
AutoComplete suggestions, and more.
As you can see, the options are very similar to those found while clicking on the Microsoft Office Button in Office 2007.