These steps will show you how to manually add a Shared Mailbox to your Outlook application on a MacOS device. 


Outlook Application on MacOS doesn't support adding shared mailboxes automatically to your application, so, this needs to be done manually.


The steps below assume that your main account is already signed into the Outlook application.


  • Click on File -> Open-> Shared Mailbox...

  • A window will open where you can type the email address or display name of the shared mailbox you want to add to your Outlook application.
  • Once you've selected the shared mailbox, click on "Add".


Be aware that Outlook will check whether you have access to the shared mailbox. If you don't have access, the shared mailbox will not be added and Outlook will display an error message.
  • If you have been given access to the shared mailbox it will be successfully added to your Outlook application, just below your main mailbox.