Additional Mailbox - "The Name Cannot be Resolved" - Exchange 2007 / Outlook 2007

We are seeing an issue whereby users attempting to open an additional mailbox from within outlook experience an error " The name cannot be resolved. The action cannot be completed "

This occurs immediately after pressing the Add button - therefore cannot be related to the mailbox we want to add.

I've attempted new profiles and tested with newly created users but the same problem exists.

The server was migrated from SBS 2003 to SBS 2008 some time ago.

Any help appreciated
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AmitIT ArchitectCommented:
Check if additional mailbox is hidden from GAL. If yes, unhide it and add it and hide it back again. You can check this under mailbox properties. Other option is to use DN value. For which you need to use ADSIEdit tool. If you know this tool use it, else don't touch it.
Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
Verify that the user can actually access the mailbox by using Outlook Web App.  Log in as the initial user and then click the username in the upper right corner to open the other mailbox.
Gareth GudgerSolution ArchitectCommented:
What permissions do the users have over the mailbox they are trying to add? Do they have Full Mailbox Access permissions?
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utilizeAuthor Commented:
It's not a hidden GAL or permissions issue on a specific mailbox. The error appears immediately after pressing the 'Add' button - therefore it's not even getting to the point of selecting a mailbox to add.
utilizeAuthor Commented:
Image Showing Problem
Here's a screenshot. As soon as 'Add...' is clicked.
Gareth GudgerSolution ArchitectCommented:
Is Outlook currently in Cached mode? What happens if you turn off Cache mode?
AmitIT ArchitectCommented:
You hide and unhide from GAL and add it after some time.
Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
Did you try opening the mailbox as I suggested in OWA?
utilizeAuthor Commented:
We are not able to reach the point whereby a mailbox can be selected, therefore it cannot be a problem with a specific mailbox.
Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
You didn't answer my question.  Can you open the mailbox in OWA?
utilizeAuthor Commented:
If you mean the original mailbox, which belongs to the logged in user, then yes.
utilizeAuthor Commented:
I'm also able to open another users mailbox through Outlook Web Access.
Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
So, here is what I'm thinking...

When you try to add the additional user's mailbox in Outlook the name does resolve, right?  But then fails when you click "Add".

Most likely what is happening is that the legacy X.500 address used internally by Exchange didn't update after your migration.  This can occur if the  “Automatically update e-mail addresses based on email address policy”  box isn't checked on the USER ACCOUNT > EMail Address tab in their AD object.

See if this is the case, and if so, check the box so that the X.500 address gets updated.  It will then take about 24-hours for the Offline Address Book to update on the client side.
utilizeAuthor Commented:

The box was not ticked. I've ticked this box and will get back to you once I've tested.

Thank you!
utilizeAuthor Commented:
Unfortunately this has not made any difference.
Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
Well, it really can only be a couple of things that cause this:
1.  Address hidden from GAL
           we've already established this isn't the case
2.  Incorrect permissions on the mailbox you are trying to add.
           you've verified that the mailbox has been granted FULL ACCESS PERMISSIONS
3.  Legacy information in the AD record
           since checking the box for Address Policy didn't seem to do the trick, follow the steps outlined in this blog post:

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utilizeAuthor Commented:
Thank you! Step 3 helped us out.
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