See the article "Booklet printing" at:
http://word.mvps.org/FAQs/Formatting/BookletPrinting.htm

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Hope this helps,
Doug Robbins - Word MVP
> I have a 100 page Word document that is formatted for
> 5.5x8.5 pages. I need to know how it needs to be set up
> for a printing company to print it in booklet format from
> a CD instead of hardcopy.