Keep in mind that that is consumer Windows. Active Directory and Exchange run on Windows Server and I'm sure every large business has a fleet of those (or has decided to ditch them in favour of Azure).

I wonder what falls in the "other" bucket. Visual Studio / MSDN come to mind. Perhaps Enterprise Services is split out from Azure & Windows Server. It looks like Dynamics might be reported separately from Office although I'd normally expect it to be grouped with it instead.