For the past 3 years my job has involved moving mountains of disparate
email onto a centralised server.
IMAP has proven to be the simplest and most robust method to do this when
there is some diversity between 'ends'. Additionally it has consistently
given the best results in terms of 'mail state' ie read, replied-to etc.
Having said all that, there is no perfect results, just best ones ;)

Good luck
Paul
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