See more Microsoft Office Word demos at http://office.microsoft.com/en-us/help/FX100485311033.aspx
You're using Microsoft Office Word 2007, and you want to share your documents with your colleagues who are still using earlier versions of Office Word. No problem. Your colleagues can open, read, and even make changes to the documents that you create in Word 2007. And you can make your Word 2007 documents fully available for editing by turning on Compatibility Mode.