Exchange2007/Outlook 2007 not showing all emails

This sounds ludicrous. 4 staff on a 20 user network are experiencing this problem. Not all emails in thier mailboxes are being displayed in Outlook. Also, Outlook says connected to exchange, but it says folder last updated "ages ago". Sometimes up to an hour prior to the current time.

If one removes cached exchnage mode and restarts, the other mails are then visible. The other mails are also visible via OWA. Its also not all mails after a specific time that are missing. Eg If there are 10 mails in the inbox today then 1,2,4,7,9 & 10 will display.

Any ideas?
xpanditAsked:
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fnichelsonConnect With a Mentor Commented:
First, I would remove them from cached mode unless there is a real need.  
Have you tried completely disabling Cached Exchange mode, close Outlook,
deleting the OST, restarting Outlook, reenabling Cached Exchange mode, and
finally stopping and restarting Outlook once more?

Sounds like with being able to see the emails in OWA, this isnt a problem with your Exchange server.

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techzterCommented:
Close Outlook and go to the following directory.
C:\Documents and Settings\User\Local Settings\Application Data\Microsoft\Outlook

Delete the .ost file.

Launch Outlook again. It will create a new cached Outlook folder. See if that fixes the issue.
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xpanditAuthor Commented:
We've done this already. It temporarily resolves the issue but it re-occurs.
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fnichelsonCommented:
May sure your users are not filtering their view in outlook
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xpanditAuthor Commented:
They definitely aren't filtering their view.
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techzterCommented:
When the file corruption takes place do you see any clues in the sync folders that might point to a reason?
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techzterCommented:
One other thought. What is the size on these mailboxes? If it is several gigs that could lead to file corruption issues.
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fnichelsonCommented:
Have you removed the users outlook profile and recreate it?
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xpanditAuthor Commented:
We have removed the user's profile; but that also resolves the issue temporarily
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