I would ran scanpst on the pst (use search to find scanpst.exe)

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Diane Poremsky [MVP - Outlook]
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> My Inbox display on the folders list is showing a (-1)
> when I have no email messages to read. When I receive an
> email that is unread the display shows nothing beside it.
> When I have 2 unread messages then the display shows a
> (1). What do I need to do to fix this problem.