horde.conf

<VirtualHost *:80>
  ServerAdmin webmaster@localhost
  
  DocumentRoot /usr/share/horde

  # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
  # error, crit, alert, emerg.
  # It is also possible to configure the loglevel for particular
  # modules, e.g.
  #LogLevel info ssl:warn

  ErrorLog ${APACHE_LOG_DIR}/error.log
  CustomLog ${APACHE_LOG_DIR}/access.log combined

  # For most configuration files from conf-available/, which are
  # enabled or disabled at a global level, it is possible to
  # include a line for only one particular virtual host. For example the
  # following line enables the CGI configuration for this host only
  # after it has been globally disabled with "a2disconf".
  #Include conf-available/serve-cgi-bin.conf

  Alias /Microsoft-Server-ActiveSync /usr/share/horde/rpc.php
  Alias /autodiscover/autodiscover.xml /usr/share/horde/rpc.php
  Alias /Autodiscover/Autodiscover.xml /usr/share/horde/rpc.php
  Alias /AutoDiscover/AutoDiscover.xml /usr/share/horde/rpc.php

  <Directory /usr/share/horde>
    php_value auto_prepend_file "/etc/apache2/scripts/proxy_client_ip.php"
    AllowOverride Limit FileInfo
  </Directory>
</VirtualHost>