Summary
How to add shared mailboxes in Outlook. This includes: departmental mailboxes, delegated access to another user's mailbox, calendar, contacts, etc.
Body
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Step 1
Open the Account Properties dialog click File -> Account Settings-> Account Settings.
Step 2
Select your account and click Change.
Step 3
Click on the More Settings button.
Step 4
Select the Advanced tab and then click the Add button.
Step 5
Type the email address of the mailbox which you’d like to access.
Step 6
Confirm all the open dialog boxes to return back to Outlook.
The mailbox should now be added to your Folder List. Please note it may take sometime for it to download all the folders in messages within the new mailbox.