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!