Adding a shared mailbox to Outlook for the Mac - Instructions for M365 Shared Mailboxes.


Old Outlook for Mac

New Outlook for Mac

Old Outlook for Mac

New Outlook for Mac

  1. In Outlook, click the "Tools" tab near the top of the window, click the "Accounts"  menu item.

  2. Click on the “Advanced“ button

  3. Choose the “Delegates” tab as below:


  4. Under the “Open these additional mailboxes” Click the “+” to get the following dialog window


  5. Enter the account name in the search field, then select it in the list below, as below:

  6. Click add and you will see the following:


  7. Click the “OK” button, and close the dialog windows.


Note: If permission to access the shared mailbox was added on the same day the account is being added to Outlook it can take 1-2 hours for the shared mailbox folders to become visible in the Outlook folder navigation list.

  1. Open Outlook for the Mac

  2. Ensure you are running Outlook using the New Outlook. Toggle the option to ON:


  3. With New Outlook enabled:

    1. Navigate to File > Open > Shared Mailbox

    2. Enter the 8 character username of the shared mailbox (e.g.

    3. Click Add

  4. Your shared mailbox will now be available to use in Outlook for the Mac

Please see the article to learn of the many new features. Note that not all features are available yet in the New Outlook for Mac.

You may prefer to continue using the Old Outlook for Mac window design and toolbar ribbon.

Need help?

Contact the IST Service Desk online or 519-888-4567 ext. 44357.