diff -Naur horde-3.2/config/mime_drivers.php.dist horde-3.2-usr_local/config/mime_drivers.php.dist
--- horde-3.2/config/mime_drivers.php.dist	2007-12-20 16:01:22.000000000 +0100
+++ horde-3.2-usr_local/config/mime_drivers.php.dist	2008-05-28 22:32:17.000000000 +0200
@@ -405,7 +405,7 @@
  * xlhtml homepage: http://chicago.sourceforge.net/xlhtml/
  */
 $mime_drivers['horde']['msexcel'] = array(
-    'location' => '/usr/local/bin/xlhtml',
+    'location' => '/usr/bin/xlhtml',
     'inline' => false,
     'handles' => array(
         'application/vnd.ms-excel', 'application/msexcel',
@@ -423,7 +423,7 @@
  * xlhtml homepage: http://chicago.sourceforge.net/xlhtml/
  */
 $mime_drivers['horde']['mspowerpoint'] = array(
-    'location' => '/usr/local/bin/ppthtml',
+    'location' => '/usr/bin/ppthtml',
     'inline' => false,
     'handles' => array(
         'application/vnd.ms-powerpoint', 'application/mspowerpoint'