I am not sure that the Add-In of which you speak is a Microsoft product. What leads you to believe that it is. I have Word 2007 installed and it has no such Add-In unless I activate the Adobe Acrobat Add-In. It does allow saving as a pdf file under the Save As dialog, though.

How, exactly, are you saving as pdf. That is, what series of commands are you using?

I assume that you are aware that justified text produced by Word is harder to read than left-justified (ragged-right) text.