A family of Microsoft word processing software products for creating web, email, and print documents.
Many factors affect the "height" of each page: Widow/Orphan control, Keep with next, Keep lines together, line spacing, spacing before/after (Paragraph formatting). Word doesn't provide full control over what fits on a page. This is all covered in Suzanne's article at http://wordfaqs.ssbarnhill.com/BottomLine.htm.
Since Doug has offered to take a closer look at your document, I recommend that you accept his offer.