How to add a shared mailbox in Office for Mac. This is not generally recommended except for administrative assistants or similar circumstances.
"Before you can become a delegate, another person must grant you delegate access to a Microsoft Exchange account. You may receive an email notifying you that you have been granted delegate access to someone's calendar, contacts, or email. To access the items for which you are a delegate, you must add the person who granted you access to your People I am a delegate for list. When you want to stop being a delegate for someone, you need to remove the person from the list." (Source: Office support article).
In Outlook, go to the Tools menu and select Account.
Click on your account (upper left corner) and then click Advanced (lower right corner).
Go to the Delegates section.
In the section People I am a delegate for select the + symbol.
Type in a username to search for the person. Once found, select the person and click Add.
Click OK to complete the process.
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