Exchange 2010 multi-tenant co-existing with Exchange 2007


Can we have Exchange 2010 multi-tenant co-existing with Exchange 2007 with same AD forest, or we should creeate a new forest with new domain.

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I have only setup Exchange 2010 multi-tenant in new forests, I would assume they would work in the same forest, but i would highly suggest creating a new domain within the existing forest.  Based on my experience with both single and multi tenant systems and organizations with multiple versions of exchange within the same domain i would assume you would have issues if everything was in the same domain.
BusbarSolutions ArchitectCommented:
No this setup is not supported
Ex2010 doesnt support the multi tenancy right now officially.
Plz see this for more details from MS official about it:
Also have a look on it

Exchange 2010 SP1 does officially support multi-tenant

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