Check file compatibility with earlier versions
Check compatibility between your Microsoft Office files to see if features that are supported.
Click the File tab.
Click Info, and then click Check for Issues.
Select Check Compatibility. Any issues between the versions are listed in the Summary.
Note Selecting the Check compatibility when saving documents check box automatically checks for compatibility issues when you save your file as an earlier version.
To save your file in an earlier format, see Save an Office file as an earlier version.