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Set up Outlook to Open a Shared Mailbox as a Second (or third, etc.) Mailbox

  1. From Outlook, access the "Tools" menu and select "Account Settings...".
  2. On the resulting dialog, click "Microsoft Exchange" from the list of E-mail accounts (it's likely the only entry in the list) and click "Change...".
  3. Click the "More Settings..." button.
  4. Click the "Advanced" tab.

    Advanced Tab

  5. Click the "Add" button.
  6. When prompted for the mailbox to add enter the shared mailbox's name as it appears in the GAL (ex: ACNS Test Mailbox) and click "OK". The additional mailbox should now appear in the list titled "Open these additional mailboxes:".
  7. Click "OK.
  8. Click "Next>" to continue with the "Change E-mail Account" wizard.
  9. Click "Finish" to complete the wizard.
  10. Click "Close" to close the Account Settings dialog. At this point, the shared mailbox should now appear as additional mailbox accessible from Outlook.