Sure, Microsoft has a huge office in Munich, and they definitely applied political pressure, too (it'd be naive to assume they didn't). The project's stated goal was to be a showcase of how Linux can work in the public sector. But because of that goal, there was also massive political pressure the other way around.
The simple truth is that Microsoft's products were/are just far superior than what the Limux initiative shipped. The Linux transition caused massive productivity losses in the municipality's administration. It's easy to say that VBS macros are evil, but if you migrate away from them, you need to provide an alternative.
Simple things like a good calendar, working printing functionality, LOTS of basic stuff - it just felt like the IT was a decade behind. Here on HN, Windows continually gets roasted by how bad its UX is compared to Mac OS. With Limux vs Windows, the difference was practically 10x as large as that.
I REALLY hope the LibreOffice transition goes well. Hopefully, this is a much wiser approach than trying to migrate everything off Windows at once.