Exchange 2003: Mail Disappearing when Outlook's caching setting is enabled.

One of the clients in our network has an issue where emails from certain contacts gets deleted from the user's mailbox without appearing in his Outlook 2007.  However, If the caching mode is turned off, the messages from those recipients come through from that point on.  All the old messages are still lost.  The message tracking in exchange shows the messages all properly being delivered to his mailbox.  There does not seem to be any pattern to who's messages will not come through and which do.  This problem has persisted through 2 reformats of the client computer.

The only thing I can think of is a corrupt server-side rule, but I do not know how to verify or fix such an issue.

Hope you guys can help as this is an on-going issue, and I really don't want to have to reset up the user's mailbox.

Thanks for the help!
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If it was a server side rule you should see the issue occur no matter how the client is setup. However you could try checking out the rules using MFCMapi.

How to delete corrupted and hidden rules from a single mailbox in Outlook 2003
If you have to delete the mailbox, use exmere to pull the user mailbox to a PST file.  Delete the mailbox but not the AD account.  After it has been deleted create a new mailbox and connect back to the user account.  Use exmerge to import the PST back to the mailbox.
VoodooFrogAuthor Commented:
So.. That bolded warning at the beginning of the microsoft article.  How likely is it that it will cause an issue with exchange?  Is it just the equivalent of a stewardess telling you "Our plane may crash at any point while you are flying with us" prior to announcing the safety instructions? Or more along the lines of "You use this on exchange and you will likely be hosed"?  
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It is along the same lines as the warning for using the registry editory.
Changes made to the Windows registry happen immediately, and no backup is automatically made. Do not edit the Windows registry unless you are confident about doing so.
VoodooFrogAuthor Commented:
That's what I figured.  They just like making work seem more intense.
VoodooFrogAuthor Commented:
One Microsoft Support call later:
The problem turned out to be the Junk E-mail settings on the Outlook Client.  The settings propagate to the Exchange server and from there to any other client that is set up.  Client Junk E-mail filters are only applied when cache mode is turned on.  This client had their junk email settings set up to only accept email from people in their safe senders list and had checked to automatically delete junk email.  How those settings came to be is a mystery; however, the mystery of the disappearing emails is solved.
Settings are found in Tools>Options>Junk Email.

Thank you for your suggestions.

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