Unable to display the folder, cannot open the mailbox for this user because the user does not have a server mailbox.

I get this error when I try to share the users folder in exchange.

I found a document on this

You receive an error message when you try to open another user's folder even if you have owner permission in Outlook 2003
Article ID : 813603
Last Review : September 1, 2004
Revision : 1.0
For a Microsoft Outlook 2002 version of this article, see 280945.

If you have the required permissions for another user's mailbox, and you try to access that mailbox in Outlook 2003, you may receive an error message that is similar to the following:
Unable to display the folder, cannot open the mailbox for this user because the user does not have a server mailbox.
This problem may occur when the two user accounts do not reside on the same Microsoft Exchange Server organization.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

I am on the same Microsoft Exchange Server organization.
We only have one organization.

Can some one please shed some light on this.

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Do you use offline folders? Try to resync the global addressbook, may be there is an issue with the name resolution against the addressbook. Also try to recreate the offline addressbook on your exchange server (right click on the "Default-Offline-Addresslist" within the management console of exchange. Try this, before you resync the global addressbook (Outlook - Tools - Send/Receive - Download Global Addressbook)

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I believe this error occurred on my client computer because they were trying to select a name off of the Contacts Address Book instead of the Global Address Book.  Thanks for the tips!
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