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Seems like it wasn't so terrible. Munich has still decided that "Where it is technologically and financially possible", the city will emphasize use on open standards and free open-source licensed software. Which seems reasonable.

from [1]:

In 2018, journalistic group Investigate Europe released a video documentary via German public television network ARD that claimed that the majority of city workers were satisfied with the operating system, with council members insinuating that the reversal was a personally motivated decision by lord mayor Dieter Reiter. Reiter denied that he had initiated the reversal in gratitude for Microsoft moving its German headquarters from Unterschleißheim back to Munich.

[1]: https://en.wikipedia.org/wiki/LiMux