Messages for a resource are sent to a non-existent account

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We have four conference facilities for each of which we have set up in
Exchange Server 2003 a resource account with a calendar. At one time
Person A and others were delegated to manage those resources.

Person A has now left. Her account has been deleted and I can find no
reference to her in any address book or as a remaining delegate. But
when resource requests are sent to one of the conference facilities,
they are also sent to Person A as well as to other resource managers.
Naturally, the request to Person A is returned as undeliverable.

It seems that somewhere in the Exchange Database - or perhaps in some
other cached data there is an invalid reference to Person A, but I
cannot find out how to discover it or fix it.

I have looked at KB 253557 and 252800 at the kind suggestion of
Lanwench [MVP - Exchange] and they fitted the situation well.
However, using MDBVU32, I could find no Schedule + EMS Interface
reference in any of the property names or values in the Associated
Messages in FLD for the Inbox or any other folder, nor any reference
to the separted delegate.

What would help is either:
1. a way to look for the stranded delegate's name in the whole of the
Exchange database, and/or
2. a way to discover, perhaps by suitable logging, where the email
message for the stranded delegate originates.
That would help me to establish what I need to fix.

More ideas welcome!
.

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