Exchange Cache mode not displaying emails

We have had 2 instances recently that both appear to be related to Excahnge cache mode.
In both cases users have not been able to see all their emails - 1st example we wanted user to empty their deleted items but they couldn't see the emails that we could when we added their account to my Outlook.
2nd problem - user didn't respond to an email - they couldn't see the email in Outlook although they could if they used OWA.Cacahe mode is useful, I don't really want to switch it off but cannot have this uncertainty.
has anyone sen a problem like this &, more importantly, found a solution?

Outlooks were both 2003 SP2
Exchange 2003
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In Cache Mode, please look at your Synchornizarton Schedule. Make sure that Outlook is not offiline.
prestigeuwAuthor Commented:
We have decided to switch off cacahe mode - not certain why this is causing a problem but without it everything is OK

Thanks anyway

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