How to show all messages in an email folder

How to show all messages in an email folder

An account I set up has an inbox with around 2,000 messages going back to the year 1999.  Both Windows Live Mail and Apple Macmail (set up for imap) show just messages going back to 2013.  I can't tell how many of the total this represents.  Is there some hidden switch that would allow all messages to be displayed?

By the way, I just set this account up yesterday and did an import from my previous provider.  As far as I can tell all messages were imported.

Thanks.
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Joe