The case you’re referring to was the adoption of a Linux based OS (LiMux) by the city administration of Munich - here is the Wikipedia article on the subject.
Unfortunately, Munich totally rolled back Linux adoption for some shady reasons later on:
Microsoft had announced in 2013 its willingness to move its German headquarters to Munich in 2016, which according to Reiter though, is unrelated to the criticism they’ve presented against the LiMux project.
In fact, there is no American-style majority voting system in Germany - as long as the elected party receives more than 5% of the vote in the federal election, it is represented in our parliament! …Nonetheless, Germany is struggling with exactly the same problem of right-wing / neo-fascist populism as basically every nation in the Western world at the moment…
For more reading on Germany’s political power / party dynamics, please have a look here!