Hi Guys, First of all My ISPConfig is Version: 18.104.22.168 I maked backups from etc and snapshots because i´m using openvz. On these days i migrate from squeze to wheezy and remove courrier and replaced it using dovecot. afterwards do debian dist-upgrade i call ispconfig upgrade.php script from 22.214.171.124 intends to rebuild every configuration script again. Everyting works normally (ftp, apache, pop/imap) dovecot is really more fast then courier but exept i have some suspect when i change mailbox quota values on painel to up user mailbox space and this box is full every old menssage on mailbox and folders is completelly removed. migration script courier-dovecot-migrate.pl executed and i moved structure /var/vmail/domain.ltd/user to /var/vmail/domain.ltd/user/Maildir respecting all dovecot rules include creation of dovecot files from courier files using migration script. If anyone pass for the same experience please share any solution or confirm this issue. I´m using thunderbird but i don´t no if have any bug on roundcube too. I will try new tests. Any assistence will be welcome now i can´t rollback from wheezy to squezze. Regards.