Compatibility Mode uses only features that are available in Word 97-2003.
It is suitable for most purposes and will be used for any document that is
saved in .doc format, rather than the Word 2007 docx or docm formats.
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Hope this helps.
Please reply to the newsgroup unless you wish to avail yourself of my
services on a paid consulting basis.
Doug Robbins - Word MVP, originally posted via msnews.microsoft.com