My wife is a first-semester law school student student. She's been using Microsoft Word 2016 pretty heavily this last semester (much more so than either of us did before now). On three different occasions,
she has observed this exact issue (twice on one document and once on another). She saves documents regularly, doesn't close without saving them, and knows the difference between Save and Save As. Every time this has happened, it's just been one day worth of
work. The misbehavior that appears to be happening is that if Microsoft Word occasionally rolls back all saves that happen on a document during a session of it being open. She's going to try periodically closing documents throughout the day instead of leaving
them open to see if that can curb the data loss. We really need a patch for this though. This is an awful behavior.
This is a long thread so I apologize if this is something that has been covered already.
Is this a document opened directly from an email?