Hey,

I am working on doing this migration myself. I have migrated some test users. And I have build this script to help me, maybe you can use it for inspiration(It is on your own risk to use it!):

#!/bin/sh #Source="/var/vpopmail/" Destination="/var/mail/vmail/" i=0 for line in $(cat mailboxs.txt) do if [ -d $Source$line.maildir ] then # Create destination echo "--Creating $Destination$line" mkdir -p $Destination$line

             # Load new data from backup
             echo "--Copy from $Source$line to $Destination$line"
             cp -a $Source$line.maildir $Destination$line

             #If they exist mv trash, send and draft to .INBOX.XXXX
             echo "--If exist then, mv trash send and draft to 

.INBOX.XXX in $Destination$line" if [ -d $Destination$line/.maildir/.Drafts ]; then mv $Destination$line/.maildir/.Drafts $Destination$line/.maildir/.INBOX.Drafts fi if [ -d $Destination$line/.maildir/.Trash ]; then mv $Destination$line/.maildir/.Trash $Destination$line/.maildir/.INBOX.Trash fi if [ -d $Destination$line/.maildir/.Sent ]; then mv $Destination$line/.maildir/.Sent $Destination$line/.maildir/.INBOX.Sent fi

             # Change the file right to the new system incl hidden files
             echo "--Changes owner to vmail:vmail on 

$Destination$line recursive" chown -R vmail:vmail $Destination$line $Destination$line.*

             # Run converter script if et reports an error we stop 

the whole script echo "--Calling courier-dovecot-migrate.pl" /home/weiser/courier-dovecot-migrate.pl --to-dovecot --convert $Destination$line.maildir current=$? if [ $current -ne "0" ]; then echo "$current" exit fi

             # move data from .maildir to ..
             echo "--Moving data from ./.maildir to ."
             mv $Destination$line.maildir/* $Destination$line
             mv $Destination$line.maildir/.* $Destination$line

             # remove old unused .maildir
             echo "--Remove old courierfiles and folder and .maildir"
             rmdir $Destination$line.maildir
             /usr/bin/find $Destination$line -name 

courierimapsubscribed -exec rm {} \; /usr/bin/find $Destination$line -name courierimapuiddb -exec rm {} \; /usr/bin/find $Destination$line -name courierpop3dsizelist -exec rm {} \; /usr/bin/find $Destination$line -name courierimapacl -exec rm {} \; /usr/bin/find $Destination$line -name courierimapkeywords -exec rm -f -R {} \; i=$(( i + 1 )) else echo "$Source$line.maildir folder not found" fi done; echo "$i mailbox mirgrated"

it needs to external files to work:

mailboxs.txt, which have a path to each mail folder: domain1/user1/ domain1/user2/ domain2/user1/

and the courier-dovecot-migrate.pl which you can find more information about here: http://wiki2.dovecot.org/Migration/Courier

good luck.

-- Kim Johansen

On 2013-04-12 11:34, ChandranManikandan wrote:

Hi, I am using Courier imap+Qmail+Vpopmail. My IMAP having slow issues on our email client while download message as well switch to another folder. I would request you to give me the procedure for migration as well let me know if anything going wrong after migrate. We have 100 mailboxes and some email box more than 25 GB. I want to access email fast in oulook client 2010 as well squirrelmail. Kindly guide me . Am waiting for your reply asap.