Inbox messages appear in Outlook, but not in OWA

I am running an Exchange Server 2003 with about 75 accounts. One of the accounts suddenly cannot see any email in their Inbox when in OWA, but the messages are there in Outlook client. Yet some other mail does show in OWA, such as "Sent Items".
I have viewed other solutions to this problem here at EE, but none are relevant to this situation. For instance, we are not viewing "Unread" messages. And new emails show up in Outlook, but not in OWA.
What other things can I look at to find out what is causing this?

Thanks.
Rohidas357Asked:
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redseatechnologiesConnect With a Mentor Commented:
Hi Rohidas357,

If you are sure it is not a view setting on OWA, then the other possibiliy is that the outlook client is downloading all mail to a PST file.

Tools > Email Accounts > Next

In "Deliver mails to the following location" is that set to "Mailbox - Username" or "Personal Folders"?

Do they have a PST file on their machine?  C:\docs and settings\username\local settings\application data\microsoft\outlook (you will need to enable hidden and system files to get there)

Hope that helps,

-red
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