The only major change that might occur is changing from a numeric
system of identifying messages to using message-ids. I.e. The
filenames would be the message-id of the message. This would
allow links to not go stale, or change, if an archive is
re-created.
I might also throw in that the M-ID is intended to be unique per message,
but that in some cases (non-compliant, broken mailers or list-software)
it might not turn out to be, so MHonArc should provide a means of detecting
if a M-ID is already used as an identifier (filename) and then select a
replacement one (add a suffix?).
just my E= 0.02