Working with a Departmental Mailbox or Calendar
Allow others to access the mail or calendar
Accessing the mailbox or calendar
How to add a shared mailbox as a full Exchange account in Outlook for Mac
How to add a shared mailbox as a full Exchange account in Outlook for Windows
Alternative methods
Setting up an Outlook profile with only a shared mailbox (not typical)
UAlbany Mail - Add a shared mailbox in Outlook (alternative method - not recommended)