Forum Discussion
ADDS trusted forests.domains A. OnPrem EX2013 B.Office 365 into new ADDS and New 0365 Tenant?
Greetings.
We have two company's (each with their own forest and single domain) that have operated in a trusted ADDS forest configuration. Each forest contains their own respective mail system. One has on-premise Exchange 2013. The other ADDS forest has O365 and uses Azure AD Connect to sync on-premise ADDS users to o365. These mail systems are utilizing Galsync (enow) to support cross forest GAL's.
We are not (yet) using o365 SharePoint, one drive, or other 0365 services other than email. *We will later in the new named entity.
We are now going to merge these two environments (ADDS forest(s) / domain(s)) into a new named ADDS entity (forest and domain) - and new o365 tenant. This new named entity will utilize many of the o365 offerings.
I have migrated/merged trusted forests, and Exchange on-premise 2010/2013 systems together via ADMT and mailbox moves. This looks to be a bit more challenging.
Has anyone performed a similar migration/merge? Would they be willing to share how they did it?
Any insight, links, or thoughts are very much appreciated.
I found something similar in a forum on reddit -https://www.reddit.com/r/Office365/comments/93f4oq/cross_forest_office_365_migration/
Thanks in advance,
7 Replies
- Howdy @harveer singh Thank you for the response. To answer your questions: 1) We do NOT plan to keep any on-premise exchange post merger. 2) It will be office 365 with objects being synchronized from on-premises active directory with AADConnect. 3) YES - The plan is to consolidate on-premises (both forests) active directory as well ( like AD user migration from one on-premises active directory to another) Would you please tell me more re: AADconnect does support synchronizing objects from two different on-premises active directories via single AADconnect server ( There are a few prerequisites though). Thanks again for your help 🙂
Hey Floyds_on_Greenwood ,
Here is an article which explains about adding an additional directory in AADConnect : https://www.mustbegeek.com/setup-azure-ad-connect-to-synchronize-multiple-active-directory-forests/
There are other links in the article talking about prerequisites like Trust between the forests, conditional forwarder etc. You can achieve the configuration without trust as well, the article is a bit old (and has a few ads now agggh) but still works well. Will drop response to your other query in some time a bit occupied right now.
Thanks
Appreciate your help very much harveer singh
Hey Floyds_on_Greenwood ,
Couple of questions here, Are you planning to keep on-premises exchange post merger ? or is it just going to be office 365 with objects being synchronized from on-premises active directory with AADConnect ? are there plans to consolidate on-premises active directory as well ( like AD user migration from one on-premises active directory to another) ? AADconnect does support synchronizing objects from two different on-premises active directories via single AADconnect server ( There are a few prerequisites though).
