I think a good try is update the new server to latest dovecot version. I migrate about 1.5M mailboxes from dovecot 1.0.X to Dovecot 2.0.X and no problems (and we have a lot of users with the "leave copy on server" option checked).
http://wiki2.dovecot.org/Migration On Thu, Apr 28, 2011 at 9:41 AM, Pete Conkin <p...@reach.net> wrote: > ----- Original Message ----- From: "Esther Yébenes --Conzentra--" < > esther.yebe...@conzentra.com> > > >> I know that lots of servers are migrated every day, and never heard >> about those problems, so I suppose it must be a solution for this, or >> maybe a better way to configure the servers. >> >> Happen to us as well. Seemed to be specific to certain email clients > though. Thunderbird and Eudora did not download all the emails, Outlook > did. > > It appeared to also occur with users that POP3 using multiple clients > (Outlook and smart phone for instance) as well as those that had Outlook set > to "Leave a copy on server for x days". > > Pete >
