Let me update my question. I got horde to work, but to do so I had to install it as a subdirectory to one of my sites. So instead of /var/www/horde I have it under /var/www/web/site1/horde, which I understand is because I did not have a mail client when ispconfig3 was installed. Since I installed ispconfig before installing ANY webmail clients, how can I install horde to /var/www/horde and have it be the default webmail client for all email domains in ispconfig3? I would like for any users to be able to go to www.theirdomain.com/webmail
and have horde work without me having to copy the horde files underneath their domain.