We're looking for information on a project that involve splitting an Exchange organization, due to company spin-off, into 2 indipendent Entra ID tenants.
At the moment the exchange on premise is 2 node Exchange 2010 DAG.
The exchange server Org is authoritative for several mail domains.
The cut-over of the company is planned to be done by fully replicating the environment, in terms of AD and servers, and then start the new company by "cleaning" all the objects not relevant.
In this scenario is also needed to plan for exchange ORG split accordingly and setup a O365 hybrid environment for each company.
The plan being considered is as follows:
Before Company cat-over
- setup 2 AADC on the On-premise domain and configure them to make a filtered Sync to the two independent ENTRA ID of the two company.
this scenario is supported as per the Microsoft Entra Connect: Supported topologies - Microsoft Entra ID | Microsoft Learn
- Setup the hybrid exchange configuration between the Exchange 2010 DAG servers and the 2 Tenants
THIS is the first point we'd like to check for feasibility. Is it possible to configure a hybrid exchange environment with 2 Tenants?
After the companies cutover on each site we will clean up the non relevant AADC and users and exchange configuration.
Any thought or idea is welcome.
