Cross domain OWA access?

Has anyone ever tried to get access to a mailbox in another domain using local domain credentials?

I have 2 domains (A & B)

There is a two way trust between the domains (different forests)

Domain B is running Exchange 2010.

A User in domain A wants access to a mailbox in Domain B.

I successfully grant access on the Domain B mailbox to the domain A user.

I go to Domain B's OWA page and successfully log on as Domain A's user.

I get an (expected) error (~you don't have a mailbox~)

Then I try to change the URL to include the target mailbox but I can't get to it. (access denied)(https://server.domainB.com/owa/mailbox@domainB.com)

The company is in the middle of a MASSIVE email migration and I'd rather not create an account in the target domain for this user and go through all that mess.

Thoughts?

Thanks in advance,

Gene
April 17th, 2015 10:12am

Hi Gene,

Have you synced the GAL for domain A and domain B?

If you want the DomainA\userA can access the mailbox in DomainB\MailboxB, the domainA\userA should be resolved in DomainB. Please run the following command in domain to check the mailbox permission:

Get-MailboxPermission -Identity mailboxB@domainB.com |where {$_.AccessRights -eq "FullAccess" -and $_.IsInherited -eq $false}

Personal suggestion, we can create Linked mailbox for DomainA\UserA in domainB. Then there would be a linked mailbox UserA@domainB.com located in domain and the linked mailbox can be log on with DomainA\UserA credential. For more information about linked mailbox, please refer to:

https://technet.microsoft.com/en-us/library/bb123524(v=exchg.141).aspx

Regards,

April 21st, 2015 2:44am

Dear,

Enable the target mailbox as remote mailbox this cmdlets will be available only on exchange 2013. Assuming you have exchange 2013.

Enable-RemoteMailbox

Thanks

Syd

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April 21st, 2015 2:59am

Enable-RemoteMailbox is available in Exchange 2010 but it is not the solution to this issue.  That command applies to hybrid configurations where a user's mailbox is in the cloud.

https://technet.microsoft.com/en-us/library/ff607313(v=exchg.141).aspx

April 21st, 2015 8:21pm

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