For what its worth, open source is en vogue in german government IT at the moment. "Dataport", a government-owned IT-company, has an open-source based project "Phoenix", as a first step in this shift of paradigm. This is interesting because Dataport used to be pretty much a windows-shop; despite old and established hierarchies and its special place in the public domain, change is happening.
(Source: I'm working in that project as a consultant)