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Jerry Meyer's avatar
Jerry Meyer
Iron Contributor
Aug 07, 2017
Solved

Migrate Exchange Hybrid Server to other domain

Hi, At a customer we have migrated almost all of the mailboxes from two different domains to One Office365 tenant. Now that we are almost done we are looking into the posibilities of migrating the Hy...
exchange online
hybrid
office 365
  • NunoAriasSilva's avatar
    NunoAriasSilva
    Aug 08, 2017

    Hi Jerry,

     

    You have to Setup a new Installation of Exchange Server on Domain B.

     

    After instalation of the new Exchange Setup, you have to Uninstall Exchange on Domain A and then Run the AD Connect Again to discover the new Exchange and after that changes you Have to setup a new Hybrid Configuration Wizard on Exchange on Domain B.

Jerry Meyer's avatar
Jerry Meyer
Iron Contributor
Aug 08, 2017

Status updat: we now have migrated everybody over to Exchange online.

So the situation now is

 

All mailboxes are in Office 365

Users are synced from 2 domains (DomainA (mailresource domain) and DomainB (userresource domain).

The hybrid server is still in domain A.

 

The question now is can we and how do we move the Hybrid server over From DomainA to DomainB. And does this impact our AzureAd Connect which is syncing from DomainA and DomainB

NunoAriasSilva's avatar
NunoAriasSilva
MVP
Aug 08, 2017

Hi Jerry,

 

You have to Setup a new Installation of Exchange Server on Domain B.

 

After instalation of the new Exchange Setup, you have to Uninstall Exchange on Domain A and then Run the AD Connect Again to discover the new Exchange and after that changes you Have to setup a new Hybrid Configuration Wizard on Exchange on Domain B.

  • Jerry Meyer's avatar
    Jerry Meyer
    Iron Contributor
    Aug 08, 2017
    Thanks for your response we will start testing this next week in our test lab :) i will keep you posted.
    • Dominik Hoefling's avatar
      Dominik Hoefling
      MVP
      Aug 08, 2017

      Keep in mind that you have to export the MailboxGUID from Exchange Online to your migrated user accounts in domain b in order to offboard users (if required).

      And, to avoid downtime, change your MX and Autodiscover record to Office 365, migrate everything to domain b, switch records (if required) back to your new on-premise infrastructure.

      Test lab is a good approch :-) Make sure your your identities will be matched correctly and everything will work.

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