Next to the answers given here by others, I would like to point out that as
of Word 2007 SP2, Word has its own PDF creator. It can be found under "Save
As" "PDF or XPS". If you have version of Word 2007 without SP2, you can
still download an add-in from the MS website with the PDF functionality.
My experience is that the quality of the PDF is as good as the one generated
by Acrobat but it is generated a lot faster. Especially when you convert
documents of a couple of hundred pages.
Yves