The state of Schleswig-Holstein is consistently relying on open source

What if you have an excel workbook that relies on a bunch of custom formulas. I would be upset if this happened in my workplace. Datasets have been far easier to handle with lambda, vstack, byrow, and the rest. I would not like this move and would have to remain a holdout. That would also frustrate me because of the division.

I must agree, unfortunately, and do so due to a reason that's way more mundane than "custom formulas": UI.

Language, form, muscle memory (call it what you will) is difficult to separate from thinking and working. I'm very picky when it comes to desktop UI: I use Linux exclusively, and I can't tolerate most Linux distros' default desktop environments. Someone who's been productive for a decade or more with Windows applications -- well, to the extent we're willing to ascribe "UI stability" to those applications' own updates -- will probably hate Linux with a passion.

I don't think such a transition can be made seamless. They should have thought about becoming Microsoft's hostage two decades ago (I guess).