I'm moving all my people to macs from windows because the amount of lost work on windows and the amount of IT help needed is much greater for windows.
Also, the anti-virus solutions on windows, which are much more needed there[1], have gotten really terrible recently. AVG was basically making the machines useless.
[1] The standard I use for new mac users is they are not administrators, like everyone is on Windows. That prompt on windows to ask to install something that all users get numb to and say "yes"? Doesn't exist for my mac users, since they aren't admins. That alone helps in so many ways.
I worked in bank for a while without admin. In many years, the only tool that needed admin rights to run was the Visual Studio C++ Debugger.
How do users lose work on Windows? Just by installing garbage all over the place?
The obvious answer is the tools fit their needs best. It's not like OSX is some big secret.
Although losing data on a user machine should of course never be crippling to a company in the first place. Make sure everything is committed to a central location, as well as backed up at regular times.