[Dovecot] Upgrade/Migration

[sottilette at rfx.it]

Current box: CentOS 4.x (32 bit), dovecot 1.02, mbox format

New box (supposed): CentOS 6.x (32/64 bit ? ), dovecot 2.04, mbox format


The server have about 3.000 active users (unix users); /var/mail is about 
100 GB; /home/Users about 150 GB

I read the docs and searched on the net, but still request hints for 
planning the migration.

32/64 bit?
Tricks to avoid users get all messages ...?

Better first update the old server from 1.02 to 2.0x or ..?

Any hints/comment appreciated ;-)


Thanks, P.




1.02 dovecot.conf:

-----------------------
protocols = pop3 pop3s imap imaps
listen = [::]
log_path = /var/log/mail/dovecot.log
info_log_path = /var/log/mail/dovecot.info.log
log_timestamp = "%b %d %H:%M:%S "
default_mail_env = mbox:~/:INBOX=/var/mail/%u
mail_full_filesystem_access = yes
first_valid_uid = 100
mbox_read_locks = dotlock fcntl
mbox_write_locks = dotlock fcntl
auth default {
   mechanisms = plain
   passdb pam {
   }
   userdb passwd {
   }
   user = root
}

-----------------------