Inbox mails disappears in Exchange 2003

I have this strange problem that none of my users has but me.  I have exchange 2003 running on windows 2003 and using OUTLOOK 2003.  Since this morning, my emails in the inbox started to disappear without any error message.  It happens to only the INBOX.  As soon as the mail arrives, it stays there for about 1 minute and then disappears.  Even my previous inbox emails disappeared.  I've checked the rules, view, autoarchieve and etc.  None of them can cause this problem.  The problem seems to be with the Exchange server itself.  When I logged-in from another machine using Outlook and OWA, emails disappears from inbox.  It also happens to all the mailboxes that I've opened in my exchange profile (not just mine).  I have no .PST file.    

Someone had same problem on this forum (Mail disappears from Exchange Inbox - asked by Chris Ham).  I followed the suggestions and changed the password to my account.  Although the account hasn't locked up, mails no longer disappear.  When I checked the security log on the domain controller, following event shows up every one minute:

The logon to account: tim_user
 by: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
 from workstation: Exchangesrv1
 failed. The error code was: 3221225578

BTW, this morning I received an email (claiming) from Comcast about my cable account statement, which I canceled about three months ago.  I clicked on the link ( I know I shouldn'd). It took me to Comcast's logon page.  I have windows XP with SP2.  Could this have something to do with this?  Any other suggestion is greatly appreciated.  Thanks
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timSAAsked:
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SembeeCommented:
It sounds like somewhere there is a machine doing one of two things...

1. Downloading your email to a pst file. Common mistake, changing the delivery location in Outlook. This could have been done on another machine somewhere on your network.
2. Downloading your email via a POP3 connection. Outlook Express etc.

Do you still have that email from Comcast? Have you looked at the headers to see if it did originate from their servers? While the spammers and phising people are good, most of them aren't bright enough to cover their tracks. Check the entire path - if one address is offshore it was a spoof.

Simon.
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timSAAuthor Commented:
Sembee,

The Comcast email is not from Comcast.  The header points to some other domain.  

As far as this problem is concerned, I had POP enabled on my account, but disabled it this morning.  I also deleted my account this morning (Didn't delete the mailbox itself).  After that, the following error stopped:

The logon to account: tim_user
 by: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
 from workstation: Exchangesrv1
 failed. The error code was: 3221225578

Later recreated the account (tim_user) without creating a mailbox and waited.  I didn't see the error above.  Then I reattached the mailbox to the newly created account.  This error started to show up every other minute.  So, I suspect there may be something in the mailbox or a virus problem, which I checked out to be clean (of course, I didn't check the M: drive and C:\program files\exchsrv).

How can I find out what machine is polling the POP account, if that's the case?     My next remedy is to kill the mailbox and account.  Any suggestion?   Thanks
 

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timSAAuthor Commented:
My account also gets locked out now.
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timSAAuthor Commented:
Sembee,

You are right. I've just disabled the POP on my account.  The errors stopped.  I will log the POP service to see what machine is polling.  Will let you know.  Thanks
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timSAAuthor Commented:
Sembee,

The problem is resolved.  Thanks for your suggestion.  It was a B2B transaction server that I've been practicing on Friday.  I've set it up to use the POP and it sucked all my emails out of my inbox.  Well, thanks for your suggestion.  I gave you that points.
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SembeeCommented:
Excellent. Glad that you have resolved the problem.
Cheers for the points.

Simon.
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