Fact #14: In 2009, the government of Munich, Germany switched from Windows to Linux. They claim to have saved more than €10 million in software licensing fees so far. But the switch may have cost them that much or more in lost productivity.
This is one of the biggest risks in switching platforms, especially in a relative instant. For example, at a vendor refresh cycle. Lost productivity is the price paid. This doesn’t mean they can’t do it incrementally though, it’s just most contract and procurement cycles don’t allow that.