How to Access a Shared Mailbox on Outlook for Mac

  1. ​​​Open Outlook. 
  2. Click the Tools menu, then click Accounts.

    Mac screenshot
     
  3. Click the Advanced... button.

    Mac screenshot
     
  4. Select the Delegates tab.

    Mac screenshot
     
  5. In the bottom pane (People I am a delegate for), click the + icon.

    Mac screenshot
     
  6. Enter the email address of the shared mailbox. Click Add.

    ​​​​Mac screenshot