As a former attorney, I'd just do a diff. Save a copy, reject all changes, then do a diff and compare side by side. As a current software engineer, Word is definitely sufficient (and understood, which sf good) for two small adversarial teams. Key words being small (two huge firms negotiating a huge deal should not be using Word) and adversarial: I think a lot of times when tech-people suggest lawyers could do a better job they forget the other side isn't trying to be helpful.