There's some progress with EU bug bounty programmes and a recent commitment to publish under CC-BY for content. The shift clearly goes that way. But running a l

There's some progress with EU bug bounty programmes and a recent commitment to publish under CC-BY for content. The shift clearly goes that way. But running a large administration with largely non-technical staff on open source can be hard. Paying for Microsoft to provide a full functioning system is in the end cheaper than hiring an army of engineers to choose, adapt and run a system. You could still make a political decision to make this shift anyway and put resources into it, but it's a risky strategy - if things go wrong/too slow you can't just stop lawmaking, statistics, funding programmes, etc for a few months.