Hi @John R ,
I'm assuming that the best method would be to create a new VM running Exchange, and then move the responsibilities for maintaining the hybrid environment from the old Exchange server to this new one.
Correct. From the perspective of Exchange side, agreed that the best way is to bring up a new VM running Exchange (and a new DC as well if necessary).
Currently seems that there's no official guidance of the whole procedure. Considering that all mailboxes are already in Exchange Online, the procedure could be simpler. Below are the basic steps for your reference:
- Create the new server(s) in Azure VM and installing Exchange there.
- Configure coexistence by joining the Azure VM servers to your existing domain.
- Update the DNS records to point to the new Azure VM.
- Rerun Hybrid Configuration Wizard (HCW) on VM Exchange to establish the hybrid connectivity between the new Exchange and Office 365.
- Decommission the old servers if desired.
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