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Jody Davis
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What could the bad effects be if we removed our hybrid Exch server that works with O365?

We plan to discuss removing our O365 hybrid next week as we're implementing Okta - which apparently does not like a hybrid mail server.  Although we chose keeping the hybrid server onprem when going to O365, all our mailboxes reside in the cloud - we kept they hybrid server onprem as we were told by our implementer we could roll back from O365 if we had issues. Now, mgmt wants to remove it completely.

We did talk to MS previously, and they stated user configurations required keeping the hybrid server if that config was chosen originally (obviously was). Adsiedit would need to be used to update exch attributes on user objects, and that's not supported. If you have probs, it's best effort ONLY.

** I need specific points to discuss with mgmt:

- What would be the specific issues we COULD run into that i can warn mgmt about so they can make the most educated choice if they go the unsupported chance, or not?  We no longer have MS premier support, so i can no longer call them directly.

             - what can i advise them could be the specific issues if we did this?

Microsoft 365Okta* Exchange Hybrid

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Jody Davis

8/22/2022 - Mon

Technically, it is not a problem to remove the last Exchange server in the organization.
Powershell and ADSIEDIT (and many other tools) can modify the needed attributes.

Simply, Microsoft has not tested (and does not want to test) this configuration without Exchange.

So, in case of some very bad problem, you can always open a paid issue/incident with Microsoft support, but they will not guarantee the resolution.

Any way, you could always reinstall later an Exchange server and reconfigure hybrid, if it was necessary.

For Microsoft, having an Exchange server will avoid some (but not all) bad configuration/incorrect values in Exchange attributes, as duplicate emails.
Note also that having Exchange does not prevent you to use Powershell, ADSIEdit and other tools, but you will just be in a known/standard configuration.
Jody Davis


- What would need to be done with ADSIEDIT once the hybrid is removed?  

- What is will we not be able to do without the hybrid?  What will change other than removing the server?

- Need to be able to explain these things to mgmt. Thanks!

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Jody Davis

That is a lot of good info, thank you. 
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