You're right in that Windows is complex operating system but how is it any different than CentOS? Sure, Powershell/DSC does make life easier but how are these u

You're right in that Windows is complex operating system but how is it any different than CentOS? Sure, Powershell/DSC does make life easier but how are these utilities necessarily any worse or better than a combination of bash, python, kickstart? Exchange Onsite deployments aren't dead, on-site email is dead. Unless, you're "too big" for the cloud (>20k users) because of <$Requirement> then Exchange is an option. Keeping data On-Premise has always been a challenge, SAN are expensive but that's what it takes if you want data locally. I can't comment on the rest but we're comparing Apples to Oranges here.