You can add a shared Exchange Online mailbox to your Outlook app on macOS desktops and laptops.
Before you begin:
You'll need to have your main account or the account with permissions to the shared mailbox already set up within Outlook for Mac.
You'll also need to be aware of which version of Outlook for Mac you're using. Outlook for Mac has an option to use 'New Outlook', which doesn't have the full functionality of the original app. For a full list of the functionality, see Microsoft's article The new Outlook for Mac. We have instructions for both versions of the app below.
Original 'Outlook for Mac'
Open the Outlook app. From the System Menu, click on Tools and select Accounts.
On the Accounts page, highlight the account with permissions to the shared mailbox and click on Advanced.
On the Advanced page, click on the Delegates tab. Under the Open these additional mailboxes: section, click on the '+'.
Search for the shared mailbox name from the Choose a Person box, highlight it and click 'Add'.
Back on the Advanced page, you should now see the shared mailbox listed. Click 'OK' and then close the Accounts page.
Your shared mailbox will now be listed in Outlook's mailbox pane.
'New Outlook'
If you have enabled 'New Outlook', click on Tools and then Accounts.
Highlight the default account and click Delegation and Sharing.
Click the Shared With Me tab and then click the + sign.
Search for the required shared mailbox, select it and click Add.
You'll return to the Shared With Me window. Click Done.
Your shared mailbox will now be listed in New Outlook's mailbox pane.
Alternative method
Alternatively, you can open another mailbox (providing you have permission to do so), via the File > Open > Other User's Folder menu item. From the search box that appears, search and choose the required mailbox, choose what you want to open (for example, Inbox) and click Open. This will open just the inbox of the added mailbox, adding it into the mailbox pane list.
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