Outlook Web - add shared mailbox to folder pane

Add a Shared mailbox so it displays under your Primary mailbox

For users of Outlook on the web, most are accustomed to opening a shared mailbox as a separate browser tab or window. If you want to monitor the email from your primary mailbox and the shared mailbox at the same time, use this method. After you complete this task, the shared mailbox and its folders are displayed in the left navigation pane each time you open Outlook on the web.

1. Sign in to your account in Outlook on the web.
2. Right-click Folders in the left navigation pane, and then choose Add shared folder or mailbox.
3. In the Add shared folder dialog box, type the name of the shared mailbox you are a member of, such as [e-mail]

The shared mailbox displays in your Folder list in Outlook on the web. You can expand or collapse the shared mailbox folders as you can with your primary mailbox. You also can remove the shared mailbox from your Folder list. To remove it, right-click the shared mailbox, and then click Remove shared folder.

Please refer to the link below for additional information on how to send email from the shared mailbox and replying to mail sent to the shared mailbox:

https://support.microsoft.com/en-us/office/open-and-use-a-shared-mailbox-in-outlook-d94a8e9e-21f1-4240-808b-de9c9c088afd#OfficeVersion=Outlook_on_the_web