when i searched for addressbook, i could only fond these & there's no globaladdressbook stated
# grep -r addressbook /var/www/roundcubemail/config/
/var/www/roundcubemail/config/main.inc.php.dist:// An ordered array of the ids of the addressbooks that should be searched
/var/www/roundcubemail/config/main.inc.php.dist:$rcmail_config['autocomplete_addressbooks'] = array('sql');
/var/www/roundcubemail/config/main.inc.php:'compose_addressbook',
/var/www/roundcubemail/config/main.inc.php:'sharedaddressbook'
/var/www/roundcubemail/config/main.inc.php:// An ordered array of the ids of the addressbooks that should be searched
/var/www/roundcubemail/config/main.inc.php:$rcmail_config['autocomplete_addressbooks'] = array('sql', 'hpj.gov.my');
although I can see there's a global addressbook on my webmail (refer to attachment)