Standard answer seems to be, mbox format, e.g. <http://n2.nabble.com/importing-mailing-list-archives-tp2084972p2134778.html>.
<http://n2.nabble.com/Archiving-old-messages-tp2169885p2530616.html> raises a question concerning duplication. I recall no related complaints from forum owners so I assume that it's not an issue :)
Regards
Graham
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