exchange/outlook downloading old email messages

Exchange and outlook working fine for years. We leave a copy of the email on server.  Today a client clicked send/recieve expecting to get todays emails but instead is getting all of his old emails re-downloaded.  HELP
BUCKBERGAsked:
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AmitIT ArchitectCommented:
Are you using Cache mode option. If yes, remove it and try again. If that works out. Delete the OST file and enable the cache mode again.
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BUCKBERGAuthor Commented:
An added note.  All emails are kept in an Exchange mailbox, not a .pst.  Research shows it appears to be a sync problem, i.e outlook has lost its chain of which emails has been read, therefore it wants to download all of them.  Is there a way of repairing the exchane mailbox?  Is it possible the mail host had a problem?
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