That's not quite right, because as long as Exchange plays well with the devices people are using who cares what it's running on? The money is made selling the s

That's not quite right, because as long as Exchange plays well with the devices people are using who cares what it's running on? The money is made selling the server anyway. iOS adoption in big companies has been driven, to a large part, by the fact integration with MS servers wasn't so hard. MS have been playing Windows platform lockdown for too long and, with the exception of the Exchange group, forgotten the embrace and extend idea, which currently finds itself at home more in Mountain View.