They still do run all that stuff, they are just letting Microsoft administer it for them increasingly, rather than fiddle-frig around with on-premise deployments. Office 365 is exploding.

Many corporations do, but Exchange and Sharepoint are no longer practically a "given" like they use to be.

So what you're saying is that no other OS has any programs that can compete with Exchange, Outlook, Office and Sharepoint.

I agree. :)

Maybe those other shitty operating systems makers should try harder if they want to replace Windows. It won't happen though because none of them care about their business customers as much as Microsoft does.