Hi Guys,
Over the last few weeks i've been reading a lot around Cross Migration, I have some doubts and information required around migrating AD User/Computer Objects and standing up a new AADConnect server in a new environment but still syncing into the SAME Azure AD & O365 tenant.
(NOT a new tenant. Same tenant, but Source of Authority is now a new AD Forest and a new AADConnect Server)
Summary:
Current Set up:
· On-Premise Active Directory (AD users) in Forest A
· All users are synced via AAD Connect server in Forest A
· Hybrid with Exchange 2010/2016 co-existence in Forest A
· Only 12 mailboxes are migrated to Exchange Online, rest in progress or on hold
Target Set up:
Due to Business reasons (new acquirement), we want to continue to use the existing O365 Tenant and Azure subscription, but need to migrate AD Objects (Source of Authority) and stand up a new AAD Connect server to sync the AD objects. Migration also includes File server Migrations and some applications
The Target environment would look like this:
· All AD Users (source of authority) are migrated to Forest B (We will set up a Two-Way trust with Forest A)
· The AADConnect server to sync all objects to the O365 tenant will also need to be stood up in Forest B
· Hybrid 2019 Exchange server for room mailbox
· The EXO mailboxes in O365 (should not be impacted during the migration)
· The UPN's will not change for the users
There is limited documentation around this online, but if anyone has any experience around this, have used any articles, please help
I know it will require an AD Migration cross-forest (maybe ADMT/3rd party like Quest) and the UPN's will not change for the users, but more around planning (coexistence/phased vs. cutover). etc.
Need for AD computer objects, GPOs, DHCP, to be migrated.
Suggestion is required to migrate from mail box from Forest A to O365 or Forest B, , Autodiscover DNS points to on prem now - Therefore, I need help in the migration approach, steps involved and precautions, also please let me know if any further information is required
Thanks
Praneeth