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Folder with messages number bracketed shows no messages when opened. Why?

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Folder with messages number bracketed shows no messages when opened. Why?

My Outlook 2013 pop3 account shows a folder with subfolders containing many messages.
The data file name is designated "pop3-IMAP.170521.pst". It is the only folder with the number in brackets "filename [nnn]".
When I open the folder it shows no messages nor are any of the messages in the subfolder visible.
How can I correct this?