Click on the + located at the bottom left corner. Select New Account.
In the Add Account screen, enter the shared mailbox email address and click Continue.
You will see the Weblogin screen. Enter your UTORid and password and click Log in.
You may see a window requesting account information. Enter your email address and UTORid password and click OK.
You will see a message about being redirected to the exchange server. Check Always use my response for this server and click Allow.
You will see an account setup confirmation. Click Done.
In the Accounts window, highlight the shared mailbox in the left-hand pane, click on the gear button and select Set as Default. Close the Accounts window.
The shared mailbox has now been configured, and it should start synchronizing the shared mailbox email messages and calendar. Depending on the volume of messages, this may take some time.