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There's a lot of legacy software that is bound to Windows, yes, but as time goes on, the amount of greenfield systems targeting Windows dwindles. From what I've seen, a lot of that software is also being actively containerized so that it can run on Linux systems, because administering legacy Windows systems is a huge pain in the ass. A lot of legacy Windows software is very difficult to containerize, because it gets it's grubby little hands in everything, but it can be done and usually that's the preferred approach.