This might change tho. The current push for digital autonomy by the EU is creating a pretty large movement towards open source and Linux in many countries. Sure, it's not an overwhelming amount of machines simply dropping windows, but it increases the amount of Linux and OSS software in government and attached business by a significant share of the market, creating a pull effect.
This might be what makes other businesses move away from Microsoft in the long run. Being able to say that the data you store is safe from US government agencies simply because you aren't attached to them anymore might be a plus in the current - and even more in future - markets.
It's similar to what happened in the server space. Everything was IIS, until it wasn't because OSS became the thing to use. These days MS rents out Linux servers.
Edit: this doesn't mean that we won't be stuck with Windows legacy stuff for the next decades tho :-(