Sorry for the Danish post i hope you can translate it.
The Ministry warns that Microsoft programs can create problems for written exams for students with Mac computers.
Users who have updated the programs to the latest version may experience the programs running slowly, freezing and crashing. This means that the examinees are delayed in their work and that parts of the answers risk being lost, write the Agency for Education and Quality and the Agency for IT and Learning in a notice to schools.
I would say this segment of @Iceblade02’s post would be the issue, in that people are locked into these systems even if they prefer to use open source software. For example, my university based in the UK requires I submit my assignments in an MS Word format that supports Microsoft’s annotations for the tutor to do all marking up and correcting/commenting on the paper there. There are ways to do the same thing with PDFs, but at least on my modules so far, it hasn’t been an option at all. That’s just for papers and such.
When it comes to exams where you’re supposed to be answering the questions and submitting them as you go, there are schools that insist on you installing monitoring software so they can make sure you aren’t cheating, which only tends to be available for Windows and Mac. I don’t know how common that sort of software is outside the US, but it’s certainly a thing.