Remove O365 and return to exchange server

Question

Hi guys, we are running a hybrid environment (exchange on-premise and O365) and we need to decommission our O365 and return to our exchange servers.
Is there any manual, procedure or idea of how we can do this?

Answer 1

Hi @Marcos Francisco

We could follow the steps below to remove the hybrid configuration from Exchange server. Please note that, it's recommended that you open a ticket and remove all vestiges under the guidance of a professional, as any accidental deletion would cause Exchange server to crash.

1. Remove the organizational relationship from the on-premises environment
2. Remove the organizational relationship from the Office 365 tenant
3. Remove the federated domain(s) from the on-premises environment
4. Remove the Email Address Policy/Policies associated with SMTP domains that have been moved to Office 365
5. Remove the Accepted Domain entries from the on-premises Exchange admin console for SMTP domains that have been moved to Office 365
6. Remove the federation trust from the on-premises Exchange environment
7. Remove the remote domain associated with the Exchange hybrid configuration using the on-premises Exchange Admin Console
8. Remove the SMTP send connector from the on-premises environment
9. Remove the inbound and outbound SMTP connectors that were created by the hybrid configuration wizard
10. Remove the HybridConfiguration object from within Active Directory

Detailed information can be checked here: How to Remove Hybrid Configuration From Exchange Server 2010

Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.

Here is the a related thread discussed about the similar issue like yours: Roll back Hybrid Exchange to On-Premise Exchange

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