Forum Discussion
Resource Forest, Account Forest - Exchange Removal questions.
However one last point to this is the customer also wants to be able to use Exchange in the Account Forest - to manage objects.
in my lab AD connect has been installed in the account forest and connected to the resource forest as well as the account forest (so 2 AD's). Was that the right thing to do? or should i have installed it in the Resource Forest?
Also, why cant i use ADMT to migrate the user accounts over and effectively merge them?
Thanks,
Robert
If you just take the attributes 1:1 from the resource forest to the account forest, you're not going to have what you want. You have (or had) linked mailboxes in the resource forest. You want a plain remote mailbox in the account forest.
ADMT also hasn't been updated in a very, very long time. It may or may not actually work for you regardless of the issue above.
You'll need to put an Exchange server in the account forest for this to work.
- I think this is pretty well documented here
https://jaapwesselius.com/2020/11/28/decommission-an-exchange-resource-forest-in-a-hybrid-environment/comment-page-1/ Robert Bollinger did you get this working? I have exactly the same scenario and just wanted to check if those steps worked or if you found out anything else that needs to be considered?
Robert BollingerSounds about right. Don't forget to copy proxyAddresses and legacyExchangeDN values as X500 proxies on users and groups to preserve autocomplete reply-ability.
BrianDesmond Thanks again.
To be clear for myself on this process, and to make sure i have the order right, with all mailboxes already migrated to office 365, I should do the following:
- Install Exchange in the Account Forest, creating a new exchange org.
- Copy MSExchange Attributes over, I will work to copy the correct ones over as i know not all need to be copied. Account should show as "office 365" mailbox in EAC in the account forest, and should show as "RemoteUserMailbox" when checking in EMS.
- Uninstall Exchange from the Resource Forest
Is that about right? I will of course test everything in my lab, before making any changes on the customers environment, and may reach out to PFE for a design review to be doubly sure.
The customer also needs to migrate all their groups to office 365 as well, however for that i think the correct course of action is to create a script (or find one) that simply creates the groups in the cloud, re-assigns all group memberships and send as, send on behalf of settings, and group security settings.
The group portion would probably need to be done first, I would imagine.
Thanks again!!
Robert
