This article describes update KB3085597 for Microsoft Office 2010 that was released on October 13, 2015. This update has a prerequisite.
Improvements and fixes
Fixes the following issue:
Assume that you compare two documents that contain a table of contents in Microsoft Word 2010. Then, you save the compared document, and then close it. When you reopen the document, it doesn't match the comparison result as it was displayed before you saved it. Items may be missing, or deleted sections may still exist.
Microsoft scanned this file for viruses by using the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to it.
You may have to restart the computer after you install this update.