Of course, the employees probably already spend 2-3 hours/year dealing with the piece of shit that is Microsoft Office. They probably also devote some amount of IT time and resources to dealing with licensing and activation issues, additional troubleshooting associated with imaging and installation procedures, etc.
Actually, really, I'm not being fair. MS Office is not a piece of shit. It's a really good application, though the whole installation/licensing/activation thing can be a bit of a nightmare at times. LibreOffice is also a very good application that most people could use as their office suit without serious difficulties. Mostly people just get upset because people know it's free. The fact that it's cheap makes them think it's "cheap" in the sense of "flimsy" and "poor quality", so they resent being moved onto it. That seems to be the single largest issue, in my experience.