Exchange 2016 multiple sites co-existence with 365 for Teams?

Kurt Stichelmans 561 Reputation points
2022-01-17T09:57:25.48+00:00

We have an Exchange Server 2016 with more than 50 mail domains (so @mail1.be, @mail2.be, @mail3.be, ....).
All those mail domains have different databases. And the users are all in a different OU. Also the oab, gal, al, ... are separated from each other. Not one client can see the address book from another client.

And now there is Teams.
We would like a co-existence with 365 so every user can see his calendar in Teams and meetings are easily clickable in Outlook or Teams.
If client A has an OU on our servers in AD and also has a Microsoft onmicrosoft.com account A (365) we should have the possibility to setup a hybrid environment.
If client B has also an OU in the same AD and also has a Microsoft onmicrosoft.com account B (365) could we setup a hybrid environment?

So one AD with different clients (different onmicrosoft accounts) => can we have a co-existence for every client?
If not, what are the possibilities if our goal is: having a calendar in Temas which is the same calendar in Outlook (the mailboxes are not configured in 365 but on a Exchange on-premise server.)

Thanks for your expertise!

Kind regards
Kurt

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  1. Yuki Sun-MSFT 41,006 Reputation points
    2022-01-18T04:08:06.44+00:00

    Hi @Kurt Stichelmans ,

    So one AD with different clients (different onmicrosoft accounts) => can we have a co-existence for every client?

    According to the sync topology included in the blog below, this seems to be an supported scenario:
    September 2020 Hybrid Configuration Wizard Update
    165876-01.png
    But it's mentioned that it allows admins to "enable Hybrid deployment with up to 5 tenants simultaneously", so this could be a problem for your environment with more than 50 domains.

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