The easy access to forms. The business server newsletter, gopher etc. I have Quattro Pro and Lotus. I don't want to spend resouces on all those licenses. Templates don't transfer that well.
Word processing has less problems.
This is a standards issue. If you just want to create a piece of paper from the electronic form that visually matches the original, this is a good way to do it. For example, the Wisconsin State Statutes are now available on the state web site in PDF format. You can't change them, of course, but they are avaiable for anyone to view. You no longer have to have the set on your shelves.