Shared folders must be manually added to your list of folders. Right-click the Folders heading and then select Add shared folder or mailbox
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In the Add shared folder window, search for the name or email address of the person sharing folders with you.
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Select Add once you find their account.
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The added folder or mailbox will appear on the left side of the window on the list of email folders. Select the folder to expand and display its contents.
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If you need to remove a shared folder or mailbox from your account, right click on the folder's menu heading and select Remove shared folder.