Outlook - Manually add shared mailbox on Mac
This article explains how Mac users can manually add a shared mailbox in Outlook for Mac.
Instructions
After Service Desk adds you as a member of a shared mailbox, it should appear automatically in the Outlook Folder pane. This process may take a few minutes. If it doesn’t you can follow the steps below.
Classic Outlook
Open Outlook for Mac.
Use either of these methods:
Go to File > Open > Shared Mailbox, or
Go to Tools > Accounts, select your Exchange account, choose Delegation and Sharing, open the Shared With Me tab, and click +.
Enter the shared mailbox name or email address, then select Add or Open.
The shared mailbox should then appear in Outlook’s folder list.
New Outlook
Choose File > Open > Shared Mailbox from the menu.
Type the shared mailbox email address (or name), then click Add.
The mailbox should appear in the folder panel.
If it does not appear in the dropdown list, send a test email to the shared mailbox first. This often forces it into the cached address list so it can be found.
If the shared mailbox disappears after Outlook restarts, try switching between legacy/new modes.