Invisible rule gives error recipient cannot be reached in Outlook

When certain users (user B and user C, but not others) send a meeting request to a particular user (user A) using Outlook, they receive a reply back from the system stating that user D cannot be reached. If user B and C send a message, everything's ok.

The server is Exchange server 2000 SP3 on SBS 2000.
User B and C can be using Outlook 2000, 2003 or 2007, depending on which system they log on to.
User A is  using Outlook 2000
User D has been deleted from the system 2 years ago.

I did find at some point some Outlook rules on user 's A Outlook that would "forward" messages (not sure anymore if these rules applied to other things than "messages") to user D, and these rules were deleted. However, it appears so that "rules" still exist somewhere somehow. Are there any ways to hunting those down and get rid of them ?

Hopefully, there will be another way than recreating the mailbox.


Here's the reply back from the system:

From: System administrator
Subject: Undeliverable: Test
Your message did not reach some or all of the intended recipients.

      Subject:      test
      Sent:      2008-11-18 18:26

The following recipient(s) cannot be reached:

      User D on 2008-11-18 18:26
            The e-mail account does not exist at the organization this message was sent to.  Check the e-mail address, or contact the recipient directly to find out the correct address.
            <Server01.domain.local #5.1.1>

PS: The name of the server and the user were changed.

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You could try cleaning up the rules
From a cmd line:
"C:\Program Files\Microsoft Office\Office12\OUTLOOK.EXE" /cleanserverrules
Your path may be different...

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rjjacquesAuthor Commented:
Bull's eye !!  I did have to use Outlook 2003, and not Outlook 2000, to run this switch.
PS: Gees, Outlook has a lot of switches....
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