Roundcube needs something like Outlook so that when an email comes into roundcube, it automatically moves it to a folder e.g. Facebook emails would be moved to a facebook folder in roundcube.
Just a thought.
Cheers
RoundCube can't do this, it has to be done by the mail server. Check the plugin repository see if there is a plugin for your mail server http://trac.roundcube.net/wiki/Plugin_Repository