Some more facts
Although the new mayors seem to make a big deal about that migration back to MS, they are not the ones who make the decision. It's up to the city council, the "Stadtrat", where several people are of the opinion that any thoughts about migrating back to Microsoft is out of the question. Otto Seidl, IT expert of the CSU party (that is, Josef Schmid's party), is still convinced that Limux was the right direction to take, any thoughts about migrating back to MS must take into account the enormous cost. Also he thinks that what Schmid thinks is just the "opinion of an attorney who doesn't know much about IT".
The same goes for Florian Schmid, another member of the city council and the Green party, who said that it came into fashion to blame all shortcomings of the public administration on the Linux IT infrastructure.