[Dovecot] move mail from server with v1.0 to server w. v2.1?

[Reindl Harald]

Am 01.02.2013 17:22, schrieb Frank Lienhard:
> I'm about to replace my old server. Both servers are on my internal network.
> The old one ist running debian lenny(32bit) with dovecot 1.0.15 and the new one debian Wheezy with dovecot 2.1.7.
> I set up the users on both systems identically (same gid uid).
> My first attempt was tho simply rsync the Maildirs along with the homes. Both deovecot versions are set up with the
> maildir format, but this results in ~30% doublicated mails on the new server.
> I then learned about doveadm/dsync, only to figure out that this isn't available in v 1.0.15 and therefor won't work.
> So which could be the most painless way to solve that?

imapsync is version agnostic and if you have a database
with the user-logins it should be easy to geenrate a shellscript

i did migration of around 200000 messages and some hundret users
from Apple OSX EIMS to dbmail/dovecot in 2009 this way

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