Not sure how far along PHP5 compatability is, but I ran into this when testing out the latest RC. Trying to configure any app via horde. PHP Fatal error: Call to undefined function domxml_open_file() in /usr/local/lib/php/Horde/Config.php on line 126 I read on php.net that DOM has been re-written, not sure if this is the issue or not, but I just thought I'd pass it along. AJ