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47451047 avatar image
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47451047 asked KaelYao-MSFT commented

How to automatically connect a mailbox in a trusted forest ?

Здравствуйте. There are two organizations. There is a trusting bilateral relationship between us. We have an Exchange server and I want to create mailboxes for their domain.

How can I do this? I also want Outlook to connect automatically.

office-exchange-server-administration
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KaelYao-MSFT answered KaelYao-MSFT commented

Hi @47451047

According to your description, I suppose you have two forests and have established two-way forest trust between them.
If this is the case, you may create linked mailbox for the users in another forest.
Please refer to this link for detailed information: Manage linked mailboxes in Exchange Server

Here are the steps:
1.access EAC>recipients>mailboxes
2.click + and select linked mailbox
3.under Trusted forest or domain you should see the account forest
4.select a domain controller in the account forest and the account (linked master account) to have a mailbox
5.set the Name, OU, logon name for the linked mailbox

To have users connect via Outlook to the linked mailbox, you may need to have a A record autodiscover.<logon domain>.com to point to the ip address of Exchange server.
And to login the mailbox, the user need to use the credentials in the account forest. (It is also the same in OWA)


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Thanks, it works !)

But I still have questions.

My domain is contoso.com
Trusted domain firma.com

1) Users from the trusted domain can access our web interface at mail.contoso.com through firma\user

How can I change this so they can log in through user@firma.com ?

2) Should I make their domain suffix contoso.com so that outlook automatically detects the mailbox ?

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Hi,
Thanks for the update.

1) Users from the trusted domain can access our web interface at mail.contoso.com through firma\user
How can I change this so they can log in through user@firma.com ?

The users should be able to login with both formats: user@firma.com and firma\user.
Is user@firma.com not working for you?


2) Should I make their domain suffix contoso.com so that outlook automatically detects the mailbox ?

No. There is no need to do this.
As the mailbox address is still user@contoso.com.
Outlook would search for the autodiscover settings of domain contoso.com. This is why you may need an A record in the account forest for Outlook to find the Exchange server.
The users are just using their credentials to authenticate to login the mailbox after autodiscover gets the mailbox settings.

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The users should be able to login with both formats: user@firma.com and firma\user.

1) Is user@firma.com not working for you?
Yes, i can only firma\user, can't user@firma.com

2) I got it, thank you !

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