This comes to us from LifeHacker and helped me out a lot today:

If someone edited your Word document without tracking changes and you need to easily see the updates. You’re not totally out of luck: the CodeJacked weblog details three ways to compare two Microsoft Word documents.

You can use a built-in comparison feature of Word itself, an external program like WinMerge, or go all command line on Microsoft’s butt and use catdoc in Cygwin. In the midst of editing chapter 10 of Lifehacker the book, I realized tracking changes wasn’t enabled, but I had great success using DiffDoc to re-track ‘em. — Gina Trapani

Thanks Gina!
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