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In Mail, in the left folder pane, right-click your account name, then select Add shared folder or mailbox.
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In the Add shared folder or mailbox dialog, type the name or email address of someone who has shared a mailbox with you, and then select Add.
The shared mailbox appears in your Folder list on the left. To remove it, you can right-click the shared mailbox, and then select Remove shared folder.
For more info, see Open and use a shared mailbox in Outlook on the web.
