Josef Schmid's personal opinion
I do speak German and have just read up on this: It's not a done deal. The Deputy Mayor doesn't like LiMux but a lot of people on the council do:
http://www.heise.de/open/meldung/Linux-in-Muenchen-Stadtrat-verteidigt-LiMux-gegen-Buergermeister-2262506.html
Oh and I know there are lots of sucky groupware applications, but Outlook/Exchange is one of them.
Maybe we should all use Notes/Domino (ducks).