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O365Buddy-5464 asked KyleXu-MSFT edited

Classic and modern Hybrid deployment coexistent in multi forest deployment ( Merger 2 or 3+ company )

Can we have one forest sync with Modern deployment and new additional forest sync to same tenant with classic deployment

or we should do manually configuration

is there any article or Microsoft docs for Muti forest deployment with different Hybrid classic and Modern coexistence.
is there any consequences
will we have to manually do all the setup at granular level.

office-exchange-hybrid-itproazure-ad-hybrid-identity
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@O365Buddy-5464

I am writing here to confirm with you any update about this thread now?
If the suggestion below helps, please be free to accept it as an answer for helping more people.

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KyleXu-MSFT answered

@O365Buddy-5464

If the AAD Connect topologies supported, you will could create hybrid for them, one tenant with multiple forests is supported. But, for the best user experience, I think the same hybrid is better:
Multiple forests, single Azure AD tenant

128903-multiforestsingledirectory.png
Multiple forests, single sync server, users are represented in only one directory
128914-multiforestseparatetopologies.png


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