Hi! I am trying to open a shared mailbox created in Exchange 2003 using Outlook 2011. I have the latest service packs, 14.3.2 for Outlook. Our organization is in the process of migrating to Exchange 2010. The Outlook profile is running on an  Exchange 2010 server. The shared mailbox is running on a Exchange 2003 server. I can open the shared mailbox using Outlook 2010 (or Outlook 2013) so there must be a setting I'm missing on the Mac. The Mac is running OS X 10.8.3.
The Tools->Accounts->Advanced button->Delegates tab allows me to select the shared mailbox. However, on the Mac the mailbox does not show on the left pane; only the primary mailbox. Windows will show the mailbox and allow me to utilize it. Using the Open Other User's folder command offers no hope.

Any ideas?