diff --git a/files/webdav.php b/files/webdav.php
index a55021b234..9e4a674c3a 100644
--- a/files/webdav.php
+++ b/files/webdav.php
@@ -3,7 +3,9 @@
  * FileManger - WebDAV access for ownCloud clients
  *
  * ownCloud clients sync by default local ownCloud dir to /clientsync on server.
- * EGroupware now automaticially mount /home/$user on /clientsync, so ownCloud clients syncs with users home-dir.
+ *
+ * EGroupware now temporary mounts vfs://default/home/$user on /clientsync,
+ * so ownCloud clients syncs with users home-dir, unless admin mounts an other directory.
  *
  * @link http://owncloud.org/sync-clients/
  * @link http://www.egroupware.org
@@ -68,15 +70,16 @@ catch (egw_exception_no_permission_app $e)
 }
 //$headertime = microtime(true);
 
-// automatically mount ownCloud default /clientsync as /home/$user, so ownCloud dir contains users home-dir
+// temporary mount ownCloud default /clientsync as /home/$user, if not explicitly mounted
+// so ownCloud dir contains users home-dir by default
 if (strpos($_SERVER['REQUEST_URI'],'/webdav.php/clientsync') !== false &&
 	($fstab=egw_vfs::mount()) && !isset($fstab['/clientsync']))
 {
 	$is_root_backup = egw_vfs::$is_root;
 	egw_vfs::$is_root = true;
-	$ok = egw_vfs::mount($url='vfs://default/home/$user',$clientsync='/clientsync');
+	$ok = egw_vfs::mount($url='vfs://default/home/$user', $clientsync='/clientsync', null, false);
 	egw_vfs::$is_root = $is_root_backup;
-	error_log("mounting ownCloud default '$clientsync' as '$url' ".($ok ? 'successful' : 'failed!'));
+	//error_log("mounting ownCloud default '$clientsync' as '$url' ".($ok ? 'successful' : 'failed!'));
 }
 
 // webdav is stateless: we dont need to keep the session open, it only blocks other calls to same basic-auth session
diff --git a/phpgwapi/inc/class.egw_vfs.inc.php b/phpgwapi/inc/class.egw_vfs.inc.php
index cf6d993bbe..b4003ba073 100644
--- a/phpgwapi/inc/class.egw_vfs.inc.php
+++ b/phpgwapi/inc/class.egw_vfs.inc.php
@@ -300,9 +300,10 @@ class egw_vfs extends vfs_stream_wrapper
 	 * @param string $path=null path to mount the filesystem in the vfs, eg. /
 	 * @param boolean $check_url=null check if url is an existing directory, before mounting it
 	 * 	default null only checks if url does not contain a $ as used in $user or $pass
+	 * @param boolean $persitent_mount=true create a persitent mount, or only a temprary for current request
 	 * @return array|boolean array with fstab, if called without parameter or true on successful mount
 	 */
-	static function mount($url=null,$path=null,$check_url=null)
+	static function mount($url=null,$path=null,$check_url=null,$persitent_mount=true)
 	{
 		if (is_null($check_url)) $check_url = strpos($url,'$') === false;
 
@@ -341,12 +342,15 @@ class egw_vfs extends vfs_stream_wrapper
 
 		uksort(self::$fstab,create_function('$a,$b','return strlen($a)-strlen($b);'));
 
-		config::save_value('vfs_fstab',self::$fstab,'phpgwapi');
-		$GLOBALS['egw_info']['server']['vfs_fstab'] = self::$fstab;
-		// invalidate session cache
-		if (method_exists($GLOBALS['egw'],'invalidate_session_cache'))	// egw object in setup is limited
+		if ($persitent_mount)
 		{
-			$GLOBALS['egw']->invalidate_session_cache();
+			config::save_value('vfs_fstab',self::$fstab,'phpgwapi');
+			$GLOBALS['egw_info']['server']['vfs_fstab'] = self::$fstab;
+			// invalidate session cache
+			if (method_exists($GLOBALS['egw'],'invalidate_session_cache'))	// egw object in setup is limited
+			{
+				$GLOBALS['egw']->invalidate_session_cache();
+			}
 		}
 		if (self::LOG_LEVEL > 1) error_log(__METHOD__.'('.array2string($url).','.array2string($path).') returns true (successful new mount).');
 		return true;