Word 2010 has the PDF Save As function built-in (typically the 7th item in the dropdown list). You don't need Adobe Acrobat for this.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]

You're right it is under the 'save and send' 7th option down, however, when I go to save there are no security options to prevent editing to the document, so that method is not sufficient.