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Googling "microsoft press" and "framemaker" produces the following:
http://www.adobe.com/products/framemaker/pdfs/mspress.pdf
To peed publishing and produce the highest quality books and interactive
training aids possible, Microsoft Press uses Adobe FrameMaker+SGML 6.0
software and the eXtensible Markup Language (XML) format. The publisher
then reuses the XML data to create self-tests and eBooks, and provides the
data to other publishers. Microsoft Press writers author titles in
Microsoft Word, and then desktop publishers import the files into Adobe
FrameMaker+SGML to gain the benefits of a structured environment.
Can anyone point me to definitive authority that disputes that? I really
doubt that MS would use Word to create 965 pages of "Microsoft Visio
Version 2002 Inside Out" and similar titles?