"Sending as" from 2 mailboxes, one of which is hidden.

We have 2 (existing & new) mailboxes that one person is required to access.
The new mailbox is HIDDEN in the GAL and forwarding to the existing mailbox.
We would like for this person to be able to SEND AS from either account by using the FROM field using a single outlook profile. Full permissions to both mailboxes have been granted to this person.

We are getting the following error:

Delivery has failed to these recipients or distribution lists:

<Insert person's name here>
You are not allowed to send this message because you are trying to send on behalf of another sender without permission to do so. Please verify that you are sending on behalf of the correct sender, or ask your system administrator to help you get the required permission.

We are using exchange 2007 (maybe 2010 soon) and Outlook 2003.

Thank you in advance for your thoughts on this issue!
dmsanderAsked:
Who is Participating?
 
tutschi69Commented:
Hi,

Ok that is not possible to bring it to work when the Mailbox is hidden!

See here:

http://technet.microsoft.com/en-us/library/aa998291(v=exchg.80).aspx


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tutschi69Commented:
You have to grant "sent as" to the user via "AD User and Computer " on Account B .To speed up, restart Informationstore.
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Mkris9Commented:
you have exchange 2007, so full mailbox permission only means - mailbox access permission. You'll have to give Send As permissions by

Recepient configuration - Mailboxes - select the hidden mailbox - on the actions pane in the right, select manage send as permissions and select the user.
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dmsanderAuthor Commented:
We've given these permissions, and we get the error only when the account is hidden.
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Glen KnightCommented:
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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