They know what they're doing because they try to create an all-Microsoft IT infrastructure? Well, even trying to do that right there shows they don't know what they're doing. And this isn't Microsoft-specific, it applies to any vendor.
Huh? Who said all M$ infrastructure? All I'm saying is the choice they make tends to be the right choice. In fact, those that chose Linux over a windows desktop (out of spite of Windows) have proven to be the wrong choice as they've had to go back to M$ for desktops. So in the end it costs them even more. That's not to say 100% of people that chose Linux was wrong, but some of the big early adopters of Linux on the desktop was just flat out wrong. But generally the suits know what they are doing and they chose what's best for their business (as long as they don't have ideologue techies working in the basement that will suggesting anything but M$).