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Or any other applications that only run on Windows - which in the enterprise world is a lot of applications, not just from Microsoft.

Still, forcing people to pay such a significant premium isn't exactly how you get people to use your product.

And I don't know about cloud pricing for Windows machines, but the price difference isn't nearly as crippling on regular VPS/physical hosting.

I was suprised to see how many Java applications run on Windows + MSSQL.