How to open a Shared Mailbox in Outlook for Mac.
Use this method if you are a delegate for another user's mailbox or when you have permissions to several folders in a shared mailbox. You can also use this method when you have full access permissions to a mailbox.
To open the shared mailbox:
In the Tools menu, choose Accounts, and select the account that has access to the mailbox.
- Select Delegation and Sharing

- Choose Shared With Me tab

- Choose + to add a shared or delegated mailbox

- Alternatively, you can also go to File > Open > Shared Mailbox, to open a shared or delegated mailbox
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