icrosoft Office has an Autorecovery function that saves files when, for example, there’s a power failure. These files are located on the home drive, in the Library (press Option when you click “GO” in the Finder command line at the top of the screen, otherwise Library is invisible). In Library, there is a folder called Application Support. In that folder are folders for a number of applications, one of which is Microsoft. In the Microsoft folder, there is a folder called Office. In that folder are a number of folders, one of which is Office 2011 AutoRecovery. Click that, and any files saved by the autorecovery function will appear.
Hierarchically:
Finder
Go
Library
Application Support
Microsoft
Office
Office 2011 AutoRecovery