Alright, thanks for the tips on vconvert - I have, in the meantime, found out that it is one of the worst documented utilities. Heck, not even inter7 has a decent man page for it. I think that vconvert -c -m domain.name will do the trick, though (or just vconvert -c -m for all domains).
That's where the present 'rub' is, though. The scenario: - I have the new server, set up with qmail-toaster, and vpopmail 5.38, qmailadmin 1.06. All configured for mysql. - I have data from the legacy server, with standard cdb files in the vpopmail configuration without mysql. So, while obviously I can just drop over the content of /home/vpopmail/domains into the new location, that doesn't really convince qmail to see any of those domains, and consequently vconvert doesn't see them either. So: - what else, besides dropping the content of /domains/ in place, do I need to do / copy over from the prior installation in order for the domains to be recognized by qmail, qmailadmin, and hence vconvert? Thanks, Harry