Our desktop PC updated itself overnight and rebooted. A Word 2013 file that was open seems to have reverted to a version that is four days old. My wife has been working on it every day and swears blind she was saving it frequently. If so, it seems to have restored an old version.

any idea how we can recover yesterday's version of the file? (When word first started today the recovered file window contained the four day old file)

thanks