Outlook 2003 with Exchange Server 2003 - mail disappears from Inbox

I have a workstation running XP Pro SP2 with all patches running Office 2003 with all patches applied.  Email comes into the Inbox and suddenly has started disappearing from the Inbox after 15 minutes or so.  The emails will be there, then you'll move back over to working in another application, but when you maximize Outlook all of the new messages since 3/30 will be gone.  Now it appears to be removing from the exchange server as well.  If I login via OWA the mailbox shows all of the messages from 3/30 and before, but nothing new.  Any ideas on where to start with this one?
anotherhickAsked:
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Olaf De CeusterCommented:
Is this mail coming in through SMTP or POP?
Olaf
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redseatechnologiesCommented:
Change the password on the account - there is a machine out there somewhere downloading it via POP3.
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anotherhickAuthor Commented:
olafdc:  The mail is kept on the Exchange server and is connected directly.  The mail server is directly online so I'm actually viewing a copy of the mail on the server and not downloading it via SMTP or POP3.

redseattechnologies: I don't have it set to POP anywhere else.  I changed the password yesterday to be sure, but no change.
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redseatechnologiesCommented:
Then there could be another outlook client out there downloading it to a PST file - does that user access any other machines?

Have a look here on the local machine -> c:\documents and settings\username\local settings\application data\microsoft\outlook

any PSTs there? (besides archive.pst?)
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Olaf De CeusterCommented:
Have you restarted the information store.
Any errors in the eventlog?
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anotherhickAuthor Commented:
No PST's there.  I did a search of the entire hard drive as well.
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anotherhickAuthor Commented:
I just restarted the IS without issue.  Only logged that it had started.  Stopped and restarted cleanly.
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Olaf De CeusterCommented:
What anti-virus are you running and have you done a spyware and virus scan lately?
Have you looked in the archive folder for these emails.
Also have a look at your rules settings.
Olaf
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Olaf De CeusterCommented:
Rerun the internet connection wizard. It will recreate your smtp virtual srver and reset most exchange settings.
Are your users in the SBS OU in AD?
Olaf
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Olaf De CeusterCommented:
Disregard last post unless you are running SBS.
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Exchange_AdminCommented:
Go to another computer and log in as this problem user.
Create an Outlook Profile to access the problem mailbox.
Does the problem follow the user to the new machine?
If not then DELETE the existing Outlook Profile on the original machine and recreate it.
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anotherhickAuthor Commented:
I tried all of the above to no avail.  I finally deleted their user and Exchange account (after backing the mailbox to a PST) and had to format the computer as well.  Issue resolved.  What a pain!
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