Topic: migrating to iredmail
I am currently using Courier with Mysql in custom directory "MailDir" /var/Mail/
I was planning to migrate to iredmail with MySQL support. I tried a plain install to check the directory structure and other things, its pretty much fast deploy-able and nice features but, with iRedMail /var/Mail custom directory turned out to be /var/Mailvmail1/test.com/p/o/s/postmaster-2012.11.02.15.50.49/ (with postmaster as default user).
What is the best practice to migrate from courier mail/MySQL to iredmail/postfix/mysql without loosing (mail and users).