Solved Thanks DJTremors: the solution was pretty simple. - switch the Roundcube database from SQLite to MySQL That's it. Thought I'd post it to help others who like Roundcube but want the port 80 thingy. Cheers, Farao
Hans has written a nice RoundCube-ISPConfig tutorial: http://www.howtoforge.com/roundcube_webmail_ispconfig