[Jtsummers]

Word has track changes which lets you view what changes have been made and who made them. But you need to turn this on (I think it's under "Review"), and you should still follow the rule of "save early, save often". C-s is my fidgety muscle-memory behavior when otherwise staring at the computer screen trying to decide what to type/do next.

It's not quite the same as versioning, because it's still possible to clear out the history of changes (in fact, when you accept changes that's what it does), but it's pretty effective.