The Microsoft Office button is used exclusively in the Microsoft Office 2007 versions of the following programs: Word, Excel, PowerPoint, Access, and Outlook (in the composing and reading windows). It is not used in any prior or subsequent version of Microsoft Office. Any guidance containing references to the Microsoft Office button applies only to Office 2007.
The Office Button is located in the upper-left corner of each Office 2007 program. Clicking it displays options such as Open, Save, Print, and Close, as well as the Options button for each program.
In Office 2010 and later, the Office Button is replaced by the File tab. The File tab is located in the same general area as the Office Button and displays most of the same commands.