?--ispconfig = port 81, webmail = port 80--?

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