Since I am the only guy with Linux experience I would have to support the Linux installations. Now the problem is what works perfectly fine for me may be a horrible experience for some of my coworkers, and even if they would only be using Firefox, Thunderbird and LibreOffice I don't know if I could seriously recommend using Linux as a desktop OS in a business. Instead I want to set up one test machine for users to try it and ask THEM if they like it. The test machine should be as easy and painless to use as possible and not look too different compared to Windows. Which distro and what configuration should I choose for this demo box?
All changes are painful, and there will always be some that will whinge and tell you that can't live with it. So, you have to prepare the ground, persuade people that it is worth it, all the same. Having worked in the industry for 30 years, I have seen a lot of changes, and the thing that I have learned is that you absolutely must do your groundwork if you want to succeed. It doesn't actually matter whether the programs are best in class or whatever - it is amazing what people can put up with if they feel it makes sense; after all, they have lived with Windows and Office, which for most of the past decades has been unstalbe and poorly designed - it is only since XP that Windows didn't unversally require reboot several times per day. I mean, just run that last sentence past your mental SYSRDR one more time - other OSes have stayed up for years since the 60es.
So, prepare people and get them on board (one really can't say this too much); after that, it will be fine. Linux is great on the desktop, as you already know, and if you do have to support people, you can use ssh -X or even Xnest, so you won't even have to climb around in the compund all that much.
IOW: make good preparations (sorry if I repeat myself). Ask people what they use their systems for, what they really want to be able to do in Linux (including the non-work things!) and find out to do it. Make plans for how you will support them and how you will teach them things. Done well, this can be great for everyone.