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HOW TO: Multiple exchange domains into single O365 tenant-any resources appreciated
I have a hybrid Exchange environment setup (2010 SP3) at myolddomain.com; SSO through ADFS/AADSync is working and a few users migrated into O365 Exchange.
I have a new domain at corp.mynewdomain.com/ADFS is configured/AADSync setup for these users, no Exchange. This is the domain folks will land on.
For AADSync in these two domains, each user is defined by UPN and "appears once in each forest". There is a two-way forest trust setup among the domains.
These two domains sync to the same O365 tenant.
Through a merger I have a 3rd domain: merger.com, no AADSync, no hybrid environment.
I need all mail to converge into mynewdomain.com in hosted Exchange in single tenant.
Plan is to setup hybrid for merger.com, so the mailboxes will show up in O365, using AADSync and ADFS, then migrate on-premise mailboxes to hosted, while UPN for all users is corp.mynewdomain.com
Users are logging into corp.mynewdomain.com at present and using old domain credentials to connect to email at both companies.
Question is how do I get the corp.mynewdomain.com users already synced to O365 to have permissions to the mailboxes in the two other domains? Primary SMTP for each user will remain either olddomain.com or merger.com, respectively
Not sure what my next step should be to make this all fit together.
I have a new domain at corp.mynewdomain.com/ADFS is configured/AADSync setup for these users, no Exchange. This is the domain folks will land on.
For AADSync in these two domains, each user is defined by UPN and "appears once in each forest". There is a two-way forest trust setup among the domains.
These two domains sync to the same O365 tenant.
Through a merger I have a 3rd domain: merger.com, no AADSync, no hybrid environment.
I need all mail to converge into mynewdomain.com in hosted Exchange in single tenant.
Plan is to setup hybrid for merger.com, so the mailboxes will show up in O365, using AADSync and ADFS, then migrate on-premise mailboxes to hosted, while UPN for all users is corp.mynewdomain.com
Users are logging into corp.mynewdomain.com at present and using old domain credentials to connect to email at both companies.
Question is how do I get the corp.mynewdomain.com users already synced to O365 to have permissions to the mailboxes in the two other domains? Primary SMTP for each user will remain either olddomain.com or merger.com, respectively
Not sure what my next step should be to make this all fit together.
David Johnson, CD
you need to add a trust relationship for the domains
ASKER
Thanks. Two-way forest trusts were set up among all domains involved first thing. All users are logging into new domain, corp.mynewdomain.com
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ASKER
I fixed this with heavy research and a support call to M$FT. I should also be able to assign myself a small amount of points as a consolation, since the "community" was not a bloody lick of help on this one.