I know one can use Windows without getting hacked. But it is not even up for debate that it is more vulnerable by far than *nix. But using one as a workstation is one thing. I wouldn't do that. But putting it on the open Internet is a nightmare few who manage servers for a living would do if they started a new system up today.

That's not to mention the cost and how much of a resource hog a Windows server is compared to a comparable *nix system.

These companies use Windows because they have always used Windows and they just paid the price for that mistake.