Sequences are a different problem. Since MH has both public and private
sequences, I would argue that the only truly "public" sequence for an
IMAP folder is one that is stored on the IMAP server. This could be
done with a file on the server, since IMAP allows fairly free form
file retrieval, or it could be done with flags where the server permits
the definition of new flags. I don't think there would be performance
issues with either option, but using flags is definitely better for
data integrity where the mail might be accessed by different clients.
When I looked at this before, a large number of IMAP servers didn't support
flags, or had a bunch of limitations on them. I think the only sequence
you can be guaranteed to support is unseen.
--Ken
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