I switched to LibreOffice as soon as it hit the repos and I don't miss a thing.
Also, I don't think we should worry too much about users coming from
Windows. Really, if they're here, they're not afraid of change.
Drop it now!
I agree with Vitor. Switching to Linux is a big change and if they are willing to change their operating system for the better, changing their office suite shouldn't be a big deal either.