macro needed, delete dupe messages

Hi All,

I am trying to clean up a large folder of undeliverable
email messages on Outlook 2000. There are 5000 messages,
but there are several dupe undeliverable messages for each
failed recipient.

Is there a macro or addin that someone can point me to
(for free)that will delete every instance of a duplicate
undeliverable, by searching the "To:" field and eliminating
all but one of these messages??

I hope I am explaining this correctly. What I am trying to
do is take the 5000 messages, shrink it down to probably
500 unique email address undeliverables.

If then, the addin could write the addresses to a file,
that would be a big plus!!!!!
Thanks....Bill