More than once I have seen a major proposal from a possible partner that showed all the changes from a previous proposal!
Unprofessional and a potential deal-killer.
To get an idea, check out the sample document on the current front page of the website metadatarisk.org. Full article here.
Emailing a Word or Excel or Powerpoint document is extremely dangerous!
You have two ways to fix this:
Convert the document to PDF before emailing it (see here).
Download this Microsoft utility that lets you "scrub" documents clean.
Don't expose yourself again!