Did not work well in Munich, my hometown, in 2004. Hope the lessons have been learned. https://itsfoss.com/munich-linux-failure/
One reason for their switch might be that Microsoft thought about opening up a big office here. Another reason might have been the study conducted by Accenture [1], who have some close ties to Microsoft...
I also enjoyed reading the interview of former Munich mayor Christian Ude [2]. Apparently, Steve Ballmer was interrupting his ski vacation in Switzerland to visit Ude and personally try to convince him to ditch LiMux.
[1] https://web.archive.org/web/20170219053640/https://www.ris-m...
[2] https://www.linux-magazin.de/ausgaben/2019/10/interview-2/
[edit: typo]