Forum Discussion
Multi Forest Hybrid with ADFS, including one none Microsoft mail system
Hi Victor,
That scenario you must have Trust between Active Directories and you cannot have the same smtp domain across Exchange.
The best way is to consolidate the Exchange in just one Active Directory and then you can have the smtp domain on that.
You can have Exchange with linked mailboxes to other domains using AAD Connect to sincronize them to Office 365.
Hi Victor,
For your scenario the best way is to consolidate with one Exchange Hybrid, because it's only supported 1 Exchange Hybrid per Tenant.
If you do not have experience with this kind of project contact a Partner with experience with this consolidations and migrations.
Thank you Nuno. I. Read you can have multi hybrid setup to a single tenant https://technet.microsoft.com/en-us/library/jj873754(v=exchg.150).aspx
I am not just clear how feasible it will be to move everyone to a new branding email address after hybrid set up.
Hi Victor,
That scenario you must have Trust between Active Directories and you cannot have the same smtp domain across Exchange.
The best way is to consolidate the Exchange in just one Active Directory and then you can have the smtp domain on that.
You can have Exchange with linked mailboxes to other domains using AAD Connect to sincronize them to Office 365.
Thanks you Nuno for the replies. Quite appreciated. So it seems it would be better to first confidante the directories to a new one. If I understand we can approach it this way:
1. Setup new AD/Exchange forest.
2. Migrate users/groups to this new AD/ Exchange forest
3. Set up ADconnect, ADFS, and exchange Hybrid to the new forest
4 Migrate users from new forest to office 365.
Regards.
Hi,
Sorry, I have to correct some statements: You can, of course, have multi-forest Exchange hybrid scenarios, even with the same shared smtp domain. But this requires some "special" knowledge and experience, like Exchange 2013+, etc.
Feel free to go via multi-forest hybrid and then consolidate your AD forests, but I wouldn't recommend this. If all companies needs to be separate and now centralized IT is used, you are good with your multi-forest migration approach.
Cheers,
Dominik
