Outlook Web Access 2003-Inbox problem/ Invalid procedure call or argument

We are using OWA  Exchange in my company, since last Tuesday we are facing a problem which is we cannot load the Inbox, Sent messages, Calendar&etc due to the following reason;
Line: 3069
Char:  3
Error: Invalid procedure call or argument.
Code: 0
We are using Windows Server 2003, Exchange 2003 & the instaled IE on the servers is IE6. We are using IE7 in the regional offices but our Head office are using Office Outlook 2007 (its working probably). So can you please advise me what is the best salutation of this problem, the cause of it & how to avoid it. Also, we can load everything only on FireFox, Opera & Safari but we cannot Send, Reply or Forward the messages.

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asem2008Author Commented:
Check the security codes, thats all.

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What do you mean exactly by check the security code? How is that done?
asem2008Author Commented:
Hi again,

Scotts all you need to do is to update the EXCHANGE server security then everything would be fine BUT you have to reboot the server after the update.

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Is there a patch or something to update the EXCHANGE security? Sorry I'm not sure how to do what you are suggesting. I appreciate your input.
asem2008Author Commented:
You can find the Exchange Anlyze tool
Start>All Programs>Exchange>Exchange Anlyze Tool
Thank you for turning me on to that tool. It looks very helpful. It wasnt installed but was able to find a download for it. Going to have it run a few tests and will review results when I have time and will let you know.

asem2008Author Commented:
I'll be waiting for your feedback.
I've got he same issue but my EBPA check comes out clean. How do you fix this issue?
asem2008Author Commented:
Hi my dear. What you mean by EBPA?
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