Super important!
After following the steps below, but before sending out a document: Go to the Microsoft button at the top of the document screen, click on Prepare, and then Inspect Document. Then click Inspect. It will run an inspection and let you know if there are any hidden revisions that you need to clear. Click Remove All if there are in fact revisions needing clearing. Then close and save the document. Now it's ready to be sent out.
Before sending out a document for outside consumption, it's a good idea to remove the editing evidence, known as tracked changes. As Microsoft will tell you, hiding tracked changes does not delete existing tracked changes or comments from the document. Instead, hiding tracked changes enables you to view the document without having to wade through strikethroughs, underlining, and balloons. To delete tracked changes, the sequence suggested by Microsoft is: