Exchange 2007 Delivery failed for deleted delegates

One of our users is getting delivery failed messages repeatedly from a user that has been deleted.  Previously we've found that this issue can be caused by users having delegates in Outlook and have deleted them.

However, we're still having the problem despite checking all users for that delegate (that we can think of).  Is there an easy way to find all the users that a user is a delegate for?  Or some other way to stop the delivery failed messages from that user?
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please check the someone's email id in AD forward to the user that is not there any more?

     ---if so remove the forwarding

Did this person have contributor level permissions or higher on anyone else's calendar?

    ---if so remove the permissions (the user may not show up by their name if they have been removed from AD, it may show as their SID instead)

Did this person have send-as permissions for another user?

     ---if so Remove those permissions

Please check also this Microsoft link to solve the issue:
stvmphAuthor Commented:
I've finally had a chance to have a close look at this and I am unable to find any references to the deleted user in the calendar of the person receiving the failed messages.  I also checked some of the entries of the users the appointments were sent to to see what they had in common and checked the mailboxes of common recipients.

Unfortunately I'm still unable to find any reference to this person and was wondering if there's a way that I can either easily search for them or to force a removal of all references to them from either exchange or outlook.
stvmphAuthor Commented:
We recreated the mailbox after this and it worked (although it was quite inconvenient).

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stvmphAuthor Commented:
It was the only solution that worked but wasn't ideal as it created a little bit of a headache.
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