A Word document can contain markup but it is up to the individual user's display options to determine whether this markup is visible on screen (or in printouts). There is a security 'feature' which automatically shows all markup by default when a document is opened which is why you would need to manually 'hide' the markup each time the document is opened.

To avoid this, you need to ACCEPT all tracked revisions and REMOVE all Comments rather than just hiding them. To do this, go to your Review tab and choose:
1. Changes > Accept > Accept all changes and stop tracking
2. Comments > Delete > Delete all comments in document

__________________
Andrew Lockton
Chrysalis Design, Melbourne Australia