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Restore the Unread Mail folder - Outlook - Office.com
If the Unread Mail Search Folder is missing, you can restore it.
What’s the size of my mailbox? - Outlook - Office.com
To check mailbox size, in the Mail view, click your account. On the ribbon, click Folder, and then click Folder Properties. Then, click Folder Size.
Switch between Outlook folders - Outlook - Office.com
The Folder Pane in the Outlook window is how you switch between the folders you use to organizer messages and other Outlook items.