Migrate Microsoft 365 tenant to another (new) tenant on the same local Active Directory (AD Connect)

Copper Contributor

Our customer wants to move from old to new microsoft tenant. 

Their set-up is :

- They have on-Prem servers with active directory

- The old tenant is synced with AD Connect, only used for users. 

- They uses mailboxes, OneDrive, OneNote, etc... 


They need to migrate to new microsoft tenant. They need the next scenario: 

- On-Prem servers will keep existing with AD Connect (users must be created by AD Connect)

- AD Connect must synchronize Users and Devices from local active directory

- Mailboxes/OneDrive/OneNote must be migrated to new tenant

- Configured Intune / Defender for Endpoint / etc...

- Security improvements (MFA, DKIM, ATP, etc...) 


I'm busy with preparing to make this goes smooth with most less downtime. So, I have the right to use a migration tool which makes I can do the pre-migration things. That's not a problem for me. But my main problem is: 
I still need to use AD Connect, because they have on-premise server. I think I can install multiple AD Connect (ofcourse on different servers). But I don't get it how to create users without having a domainname? Because you can use 1 domainname for 1 tenant? What's the best way to make this smooth? 

If you have more advises, let me know, too much advises is not a problem! 


Thanks in advance! 

2 Replies
the combination of these 3 tools addresses your need:

You can perform your migration with a solution like this:

For detaching and reattaching the domain I would suggest to use this feature during the detaching operation

Intune and laptop migration