Extremadura was in the news years ago for rolling out a lot of GNU/Linux desktops overnight. Now that they have more experience and presumably a more complex system, they are going to a complete Debian GNU/Linux solution on all desktops over the next few months.
“The CIO says the most important reason for the migration to open source is the need to unify all the desktops of the civil servants. The desktop needs to be strong, easy to use and easy to manage and support remotely, without viruses and free from security problems which are common to proprietary solutions. “And of course, it needs to be free. Because our budget for this plan is of zero euros.””
So, what some supporters of that other OS claim, that applications require people to run that other OS is just untrue. The last few thousand desktops in Extremadura’s government say so.