Just as you can do with your primary folders, you can expand or collapse the shared mailbox folders. In Outlook on the web, you should see the mailbox in your Folder list.
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Follow these steps to use your primary mailbox and the shared one simultaneously: Unfortunately, the Outlook app on your mobile device won’t allow you to use the shared mailbox, but there is a workaround. If you or your team members need to take work on-the-go, you can access the shared mailbox from a smartphone or tablet, too. Using a Shared Mailbox with a Mobile Device
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A communal email center is also an asset if your employees are responsible for responding to customer inquiries. A shared mailbox in Microsoft Outlook will prove invaluable if your team is collaborating on a project, as they can exchange messages from a central platform.