Apr 04 2019 07:06 PM - edited Apr 04 2019 07:12 PM
Scenario:
- 1 tenant contoso.onmicrosoft.com with AAD connect
- 2 domain forest (contoso.som, fabrikam.com)
- users in forest contoso.com have 10GB mailbox data each
- need to move all users and mailbox data from contoso.com to fabrikam.com (contoso.com will be deleted)
- moved users should still use SMTP domain contoso.com
What is the best way to address the migration requirement?
Apr 04 2019 11:52 PM
Is this related to the other thread, or a separate scenario? As in, what's the end goal here, move all the mailboxes to a single tenant in O365, or move them between the on-premises forests?
Apr 04 2019 11:56 PM
@Vasil Michev this is a separate scenario, target is to move users to new AD forest
Apr 05 2019 10:57 AM
So where are the mailboxes located, On-Prem or in ExO? If On-Prem, you will have to do some cross-forest moves in addition to the ADMT migration. If they are in ExO, you might be able to just to the ADMT part, then "match" the new user accounts against the cloud mailboxes.
Here are some guides to get you started: https://secureinfra.blog/2011/06/10/exchange-2010-cross-forest-migration-step-by-step-guide-part-i/
Apr 12 2019 12:12 AM
@Vasil Michev any guide on how to match the new user accounts against the cloud mailboxes.?
Apr 12 2019 09:49 AM
You'll probably have to use the hard-match method, as I imagine their immutableIDs will already be populated.