question

selvakumarsrinivasan-7231 avatar image
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selvakumarsrinivasan-7231 asked ·

Hybrid server migration from one forest to another forest

Hi,

We are in hybrid model.let me explain my scenario below.

Forest A Forest B

Exchange 2016 Exchange online

                AAD connect

All exchange mailboxes migrated to office 365 and keeping exchange server in forest A for hybrid. now customer wants to change primary smtp address for all mailboxes. example from contoso.com to fabrikam.com.then decommision the hybrid server in forest A and install hybrid in forest B. is it possible to migrate hybrid same version from one forest to another forest and also they will change the namespaces as per their standard.

office-exchange-hybrid-itprooffice-exchange-server-deployment
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LydiaZhou-MSFT avatar image
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LydiaZhou-MSFT answered ·

Yes, it's supported to deploy the hybrid in forest A, and remove the hybrid configuration, then deploy the hybrid on forest B.

When do you want to change the primary SMTP address? Before or after deploying the hybrid in forest B?
If all mailboxes are move to O365 and the hybrid configuration is removed, you can change to use fabrikam.com from O365. If you still have mailboxes on on-premises Exchange, you can change UPN and primary SMTP address before moving to O365.

Additionally, you can check this for more information about adding a new domain to Microsoft365: Add a domain to Microsoft 365


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Just checking in to see if above information was helpful. If you have any questions or need further help on this issue, please feel free to post back.

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Do you deploy the hybrid successfully on forest B and change primary SMTP address?
Please let us know if you would like further assistance.

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HI I've found myself on the same need today
what's the best way to do it?
-remove current EHC from domain1
-deploy new at domain2 , what else do we need to do?
forest1 : domain1 : source new.contoso.com >> hybrid server is here >> (smtp gateway) >> EOP
forest2 : domain2 : target corp.contoso.com >> Azure AD connect >> cloud
trust two-way non transitive

66176-exchybrid.png


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exchybrid.png (41.9 KiB)
abhayk84 avatar image
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abhayk84 answered ·

@LydiaZhou-MSFT : I have some addition question .

I have an environment A (Hybrid exchange ).
I have to migrate to a New domain B which is not yet existing . I have to retain email address of domain A .
can i add domain B in Tenant A and verify domain B and add authoritative domain B in on prem ad + add the DNS sufix , re run the hybrid wizard .

questions
1: do i need to re-join the exchange server in domain B in exchange environment or do i have to deploy in domain B and one more server to form a DAG?
2:If i move all the required users to O365 and move remaining users to the exchange server in domain B .
3: At what point i need to break the hybird and rerun hybrid wizard in domain A and B

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