Windows was important in the 90s. Wake up that is so last century.
Some of us grown-ups have to use our computers for *work* and can't just choose whatever OS has the prettiest icons, you know. That's why Windows still runs the vast majority of the world's workstations.
The company I work for is on track to be Microsoft free by Q3 2017. We are already MS free on the workstation side, but there are things like Great Plains, that they got backed into a corner YEARS ago, that are a lot harder to let go of. Even that will be gone Q1 2017, the two biggies are the SQL server clusters, they will be the last to go.
So don't cry me a river about it isn't possible to run a big corporation without sucking on the MS teat. I have helped several companies shed at least the MS workstation weight, and this will be the first that has decided to go *entirely* MS free.
Now I am not a graphics person. But I can still see that in the professional gfx world, Photoshop is still king. However, the shops that have custom software, and don't have the source code -- well they were just stupid.