If you are using the NEW version of Outlook on MAC.
- Click Outlook in the top menu bar, then select Settings.
- Click Accounts.
- Select your Microsoft 365 account from the list on the left.
- Click Delegation and Sharing.
- Go to the Shared With Me tab.
- Click the + (plus sign) icon in the bottom-left corner.
- Search for the shared mailbox by typing its name or email address.
- Select it from the results and click Add.
- Click Done and restart Outlook if the mailbox doesn't appear immediately
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