Duplicate mail removal

[ocl]

I am not talking about Cyrus's inbuilt feature.

I, as well as other users, had more or less a mess
of duplicate (sometimes multiplicate) emails in
their email clients.

We uploaded all these to our respective mail accounts
so that they are all in a central place.

Now, we need a peiece of software that will

-- remove duplicate copies in any given (sub-)folder

-- help Cyrus to reduce any duplicates (that exist
    accros user accounts) to single instance.

Does anyone know of such goodie.

Cheers,
Ray

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