> They can still be quietly unhappy, locked into the platform with hundreds of thousands of man-hours invested into proprietary applications that depend heavily on major, hard-to-replace platform components (see: WPF, not implemented by Mono, or Silverlight, hit and miss via the unmaintained Moonlight), and buying server licenses due to a change in the way change in the way servers are provisioned.

What change in the way servers are provisioned? Many companies still use Windows Server 2003 and even .NET 4.5 is supported on it. That sounds like FUD.

>They can still be quietly unhappy, locked into the platform with hundreds of thousands of man-hours invested into proprietary applications

They can also be happy with the ease of use of Active Directory and Group Policy instead of relying on half baked convulted perl scripts cooked up by a long gone sysadmin. Please, you're just embarassing yourself with your ignorant assumptions.