Write with Word? ergh… think again, there’s loads of better alternatives:
http://www.spacejock.com/yWriter4.html <– read the ‘about’ section
Personally I use http://buzzword.com and like Final Draft and Celtx. Google em 🙂

Mark Mapstone is a skateboarder, a writer, and author of the Ethan Wares Skateboard Series books.
Follow Mark on Instagram: @7plywood
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Is any of this software Mac compatible?
buzzword yes: Its a flash web based app. Final Draft: yes, its the industry standard screen writing software. yWriter: no, Celtx: can’t remember.
Check out: http://www.lifehack.org/articles/communication/the-ultimate-writing-productivity-resource.html