Remove last Exchange server from hybrid environment

Question

Hi,

We are Company of 10K mailboxes, and now we haves moved our mailboxes to Office 365, there are no mailboxes in on-prem Exchange. Just being used for Hybrid configuration and SMTP relay.

Now we are planning to remove the last server from our environment. We using about other Tool for on-prem SMTP relay which send emails to Office 365 server.

Now my Questions are

1: What are recommendations is such scenario, do we keep Single Exchange server ?

2: if we decide to remove last server then do we need to remove Dirsync as well? But we can’t remove Dirsync it is being used for Azure services.

3: what is process for removing the last Exchange server ?

4: What all things we need take care before removing the server ?

Answer 1

Hi @Rohit Ghosalkar

If you still have synced users from on-premise active directory you should keep at least one Exchange server to be able to edit Exchange attribute on on-premise active directory.

For your information synced objects in Entra ID cannot be modified from Azure portal , you can modify it only from on-premise Exchange server or active directory.

For more information please read this Microsoft article:

Why you may not want to decommission Exchange servers from on-premises

---

Please don't forget to accept helpful answer which helps users to know the answer solved the author's problem.