My organization is currently in a hybrid setup with Exchange Online and 1 on-premise Exchange 2013 server. We would like to move to Exchange Online only and remove the hybrid setup. Since it sounds like you must keep a hybrid as long as you're using DirSync, would this scenario work?
1. Remove Centralized Mail Transport by re-running the hybrid configuration wizard (we no longer need mail to flow through our on-premise server).
2. Get the management version of Exchange from Microsoft (I'm assuming this is a stripped down version of 2016, which would be preferable to just keeping Exchange 2013), and install that on a VM.
3. Uninstall Exchange 2013 using the control panel.
I have never had more than one on-premise Exchange Server, so I'm unsure about the complexities of introducing one temporarily so our on-premise Exchange could be virtual. Any insight would be greatly appreciated.