Hi I have followed this tutorial http://www.howtoforge.com/how-to-install-roundcube-0.7-for-ispconfig-3-on-debian-squeeze But when trying to access webmail, I get the following error. ERROR 500 - Internal Server Error! I have commented out all the lines in the htaccess file and have tried to remove the htaccess file but can't seem to get rid of this error. Any assistance would be greatly appreciated. This is a multiserver setup on Debian Squeeze and I installed the webmail on the web server.