A family of Microsoft word processing software products for creating web, email, and print documents.
Thank you, Stefan, but I don't think this is the issue.
à) Why would the current printer cause a header to be inserted? Page size and margins, perhaps, but inserting elements? It would be a bug if elements were actually added.
b) Microsoft Office is no all about collaboration - one of the major improvements touted by Microsoft for version 2016 is improved collaboration. Converting to PDF before send is contrary to the intended use of Office as a collaborative tool (as an MVP, please explain how the review system works if we collaborate between each share, which in any case eliminates the possibility of real-time collaboration).
In any case, converting to PDF doesn't help - see the following workflow:
I create document on desktop, store it on Skydrive, meet someone, open document during conversation on phone, discover document has changed before I can convert to PDF.
Any other ideas?