Delegating a mailbox to another domain forest.

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Delegating a mailbox to another domain forest.

Андрей Михалевский 3,426

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.

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Answer 1

Anonymous

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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Андрей Михалевский 3,426 Reputation points

2021-07-08T05:53:37.64+00:00

Could you explain in more detail what I have to do?
Anonymous

2021-07-08T06:42:32.86+00:00

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
Anonymous

2021-07-08T07:10:30.787+00:00

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.
Anonymous

2021-07-12T08:37:00.59+00:00

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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Answer 2

Андрей Михалевский 3,426

Thank you. I get it, it's not possible.

Viktoria Gindosova 5 Reputation points

2023-09-25T12:42:59.9966667+00:00

Just in case, somebody is still searching some info on that. It worked for me to open cross-forest calendar and get information about attendees, open meeting, update, delete, or create a new meeting with corresponding permissions.

Main point is to create a mail user, not contact in another forest (with specific properties).

But dew to several reasons I have concerns this will be supported by vendor. But anyway you can check details in my blog:

https://viktgin.com/2023/09/25/cross-forest-free-busy-in-exchange-server-environment-via-availability-address-space-and-calendar-delegation/

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Delegating a mailbox to another domain forest.

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