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Hello. There are two forests.
How to delegate a mailbox from domain B, to domain A ? There is a two-way trust relationship between them.
Hi @Андрей Михалевский ,
Based on my research and tests, I think the Exchange server doesn't provide the function of delegating user A mailbox to user B who is from another forest.
I tried the linked mailbox, cross-forest mail contact and so far there are no methods could working for our case. They all failed with "You don't have permission to open this mailbox".
I find one article that's about cross forest delegation using the Outlook client to sync their calendar on Exchange 2010: Exchange Server 2010 Cross Forest Delegation
And here is a similar case about Exchange Cross Forest Shared mailbox delegation, hope those could help.
Best regards,
Lou
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Could you explain in more detail what I have to do?
Thank you. I get it, it's not possible.
Hi @Андрей Михалевский ,
Actually if you wanna give a Full Access permission to user B, I think that's impossible, which means you couldn't open a domain A mailbox from domain B.
But for the shared mailbox, you could refer to the second link above.
If you want to GALSYNC, the steps are listed here: https://learn.microsoft.com/en-us/exchange/deploy-exchange-2013-in-a-cross-forest-topology-exchange-2013-help?redirectedfrom=MSDN#deploy-exchange-2013-in-a-cross-forest-topology-with-forefront-identity-manager-2010-r2-sp1
Best regards,
Lou
I also tried to add the full access rights to the domain-b user, succeeded, but still, I can not open the domain-a mailbox with Open Another Mailbox on OWA.
Hi @Андрей Михалевский ,
Do the suggestions above help? If the issue has been resolved, please click “Accept as answer” to mark the helpful reply as an answer, this will make answer searching in the forum easier and be beneficial to other community members as well.
If you are still stuck in this issue, please feel free to post your questions.
Regards,
Lou
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