Accessing a Shared Mailbox Using Outlook for Mac

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In Outlook for Mac, select the Tools drop down menu and then Accounts.
In the window that appears, select your Office 365 account and click the Delegation and Sharing... button.
Click the Shared with me tab, then click the Add (plus) button.
Select the desired user from the search result list that appears and click ADD
Click OK again to close the accounts window. After a period of time that shared mailbox will appear as a folder in the View list on the left side.