diff --git a/infolog/inc/class.infolog_bo.inc.php b/infolog/inc/class.infolog_bo.inc.php
index c871ebb531..3ba796ec2c 100644
--- a/infolog/inc/class.infolog_bo.inc.php
+++ b/infolog/inc/class.infolog_bo.inc.php
@@ -290,53 +290,73 @@ class infolog_bo
 	 * @param int|array $info data or info_id of infolog entry to check
 	 * @param int $required_rights EGW_ACL_{READ|EDIT|ADD|DELETE}
 	 * @param int $other uid to check (if info==0) or 0 to check against $this->user
+	 * @param int $user=null user whos rights to check, default current user
 	 * @return boolean
 	 */
-	function check_access($info,$required_rights,$other=0)
+	function check_access($info,$required_rights,$other=0,$user=null)
 	{
 		static $cache = array();
 
+		if (!$user) $user = $this->user;
+		if ($user == $this->user)
+		{
+			$grants = $this->grants;
+			$access =& $cache[$info_id][$required_rights];	// we only cache the current user!
+		}
+		else
+		{
+			$grants = $GLOBALS['egw']->acl->get_grants('infolog',$this->group_owners ? $this->group_owners : true,$user);
+		}
+
 		if (!$info)
 		{
-			$owner = $other ? $other : $this->user;
-			$grants = $this->grants[$owner];
-			return $grants & $required_rights;
+			$owner = $other ? $other : $user;
+			$grant = $grants[$owner];
+			return $grant & $required_rights;
 		}
 
 		$info_id = is_array($info) ? $info['info_id'] : $info;
 
-		if (isset($cache[$info_id][$required_rights]))
+		if (!isset($access))
 		{
-			return $cache[$info_id][$required_rights];
-		}
-		// handle delete for the various history modes
-		if ($this->history)
-		{
-			if (!is_array($info) && !($info = $this->so->read(array('info_id' => $info_id)))) return false;
+			// handle delete for the various history modes
+			if ($this->history)
+			{
+				if (!is_array($info) && !($info = $this->so->read(array('info_id' => $info_id)))) return false;
 
-			if ($info['info_status'] == 'deleted' &&
-				($required_rights == EGW_ACL_EDIT ||		// no edit rights for deleted entries
-				 $required_rights == EGW_ACL_ADD  ||		// no add rights for deleted entries
-				 $required_rights == EGW_ACL_DELETE && ($this->history == 'history_no_delete' || // no delete at all!
-				 $this->history == 'history_admin_delete' && !isset($GLOBALS['egw_info']['user']['apps']['admin']))))	// delete only for admins
-			{
-				return $cache[$info_id][$required_rights] = false;
-			}
-			if ($required_rights == EGW_ACL_UNDELETE)
-			{
-				if ($info['info_status'] != 'deleted')
+				if ($info['info_status'] == 'deleted' &&
+					($required_rights == EGW_ACL_EDIT ||		// no edit rights for deleted entries
+					 $required_rights == EGW_ACL_ADD  ||		// no add rights for deleted entries
+					 $required_rights == EGW_ACL_DELETE && ($this->history == 'history_no_delete' || // no delete at all!
+					 $this->history == 'history_admin_delete' && (!isset($GLOBALS['egw_info']['user']['apps']['admin']) || $user!=$this->user))))	// delete only for admins
 				{
-					return $cache[$info_id][$required_rights] = false;	// can only undelete deleted items
+					$access = false;
 				}
-				// undelete requires edit rights
-				return $cache[$info_id][$required_rights] = $this->so->check_access( $info,EGW_ACL_EDIT,$this->implicit_rights == 'edit' );
+				elseif ($required_rights == EGW_ACL_UNDELETE)
+				{
+					if ($info['info_status'] != 'deleted')
+					{
+						$access = false;	// can only undelete deleted items
+					}
+					else
+					{
+						// undelete requires edit rights
+						$access = $this->so->check_access( $info,EGW_ACL_EDIT,$this->implicit_rights == 'edit',$grants,$user );
+					}
+				}
+			}
+			elseif ($required_rights == EGW_ACL_UNDELETE)
+			{
+				$access = false;
+			}
+			if (!isset($access))
+			{
+				$access = $this->so->check_access( $info,$required_rights,$this->implicit_rights == 'edit',$grants,$user );
 			}
 		}
-		elseif ($required_rights == EGW_ACL_UNDELETE)
-		{
-			return $cache[$info_id][$required_rights] = false;
-		}
-		return $cache[$info_id][$required_rights] = $this->so->check_access( $info,$required_rights,$this->implicit_rights == 'edit' );
+		// else $cached = ' (from cache)';
+		// error_log(__METHOD__."($info_id,$required_rights,$other,$user) returning$cached ".array2string($access));
+		return $access;
 	}
 
 	/**
@@ -1204,11 +1224,13 @@ class infolog_bo
 	 *
 	 * @param int|array $id id of entry or entry array
 	 * @param int $check EGW_ACL_READ for read and EGW_ACL_EDIT for write or delete access
+	 * @param string $rel_path=null currently not used in InfoLog
+	 * @param int $user=null for which user to check, default current user
 	 * @return boolean true if access is granted or false otherwise
 	 */
-	function file_access($id,$check,$rel_path=null)
+	function file_access($id,$check,$rel_path=null,$user=null)
 	{
-		return $this->check_access($id,$check);
+		return $this->check_access($id,$check,0,$user);
 	}
 
 	/**
diff --git a/infolog/inc/class.infolog_hooks.inc.php b/infolog/inc/class.infolog_hooks.inc.php
index 360315e608..f5e64d9b68 100644
--- a/infolog/inc/class.infolog_hooks.inc.php
+++ b/infolog/inc/class.infolog_hooks.inc.php
@@ -63,6 +63,7 @@ class infolog_hooks
 			'add_id'     => 'action_id',
 			'add_popup'  => '750x550',
 			'file_access'=> 'infolog.infolog_bo.file_access',
+			'file_access_user' => true,	// file_access supports 4th parameter $user
 			'edit'       => array(
 				'menuaction' => 'infolog.infolog_ui.edit',
 			),
diff --git a/infolog/inc/class.infolog_so.inc.php b/infolog/inc/class.infolog_so.inc.php
index 756ea2c9fc..91367df223 100644
--- a/infolog/inc/class.infolog_so.inc.php
+++ b/infolog/inc/class.infolog_so.inc.php
@@ -83,13 +83,16 @@ class infolog_so
 	 * @param array $info infolog entry as array
 	 * @return boolean
 	 */
-	function is_responsible($info)
+	function is_responsible($info,$user=null)
 	{
-		static $user_and_memberships;
-		if (is_null($user_and_memberships))
+		if (!$user) $user = $this->user;
+
+		static $um_cache = array();
+		$user_and_memberships =& $um_cache[$user];
+		if (!isset($user_and_memberships))
 		{
-			$user_and_memberships = $GLOBALS['egw']->accounts->memberships($this->user,true);
-			$user_and_memberships[] = $this->user;
+			$user_and_memberships = $GLOBALS['egw']->accounts->memberships($user,true);
+			$user_and_memberships[] = $user;
 		}
 		return $info['info_responsible'] && array_intersect((array)$info['info_responsible'],$user_and_memberships);
 	}
@@ -100,10 +103,15 @@ class infolog_so
 	 * @param array|int $info data or info_id of InfoLog entry
 	 * @param int $required_rights EGW_ACL_xyz anded together
 	 * @param boolean $implicit_edit=false responsible has only implicit read and add rigths, unless this is set to true
+	 * @param array $grants=null grants to use, default (null) $this->grants
+	 * @param int $user=null user to check, default (null) $this->user
 	 * @return boolean True if access is granted else False
 	 */
-	function check_access( $info,$required_rights,$implicit_edit=false )
+	function check_access( $info,$required_rights,$implicit_edit=false,array $grants=null,$user=null )
 	{
+		if (is_null($grants)) $grants = $this->grants;
+		if (!$user) $user = $this->user;
+
 		if (is_array($info))
 		{
 
@@ -125,14 +133,14 @@ class infolog_so
 		}
 		$owner = $info['info_owner'];
 
-		$access_ok = $owner == $this->user ||	// user has all rights
+		$access_ok = $owner == $user ||	// user has all rights
 			// ACL only on public entrys || $owner granted _PRIVATE
-			(!!($this->grants[$owner] & $required_rights) ||
-			$this->is_responsible($info) &&			// implicite rights for responsible user(s) and his memberships
+			(!!($grants[$owner] & $required_rights) ||
+			$this->is_responsible($info,$user) &&			// implicite rights for responsible user(s) and his memberships
 			($required_rights == EGW_ACL_READ || $required_rights == EGW_ACL_ADD || $implicit_edit && $required_rights == EGW_ACL_EDIT)); // &&
 			//($info['info_access'] == 'public' || !!($this->grants[$this->user] & EGW_ACL_PRIVATE));
 
-		//echo "<p align=right>check_access(info_id=".$info['info_id'].",required=$required_rights,implicit_edit=$implicit_edit) owner=$owner, responsible=(".implode(',',$info['info_responsible'])."): access".($access_ok?"Ok":"Denied")."</p>\n";
+		// error_log(__METHOD__."($info[info_id],$required_rights,$implicit_edit,".array2string($grants).",$user) returning ".array2string($access_ok));
 		return $access_ok;
 	}
 
diff --git a/phpgwapi/inc/class.egw_link.inc.php b/phpgwapi/inc/class.egw_link.inc.php
index 098b225bb5..6fd4a3b3fc 100644
--- a/phpgwapi/inc/class.egw_link.inc.php
+++ b/phpgwapi/inc/class.egw_link.inc.php
@@ -57,8 +57,10 @@
  *			'add_id'     => 'link_id',				// --------------------- " ------------------- id
  *          'add_popup' => '400x300',				// size of popup (XxY), if add is in popup
  *			'notify' => 'app.class.method',			// method to be called if an other applications liks or unlinks with app: notify(array $data)
- * 			'file_access' => 'app.class.method',	// method to be called to check file access rights, see links_stream_wrapper class
- *													// boolean file_access(string $id,int $check,string $rel_path)
+ * 			'file_access' => 'app.class.method',	// method to be called to check file access rights of a given user, see links_stream_wrapper class
+ *													// boolean file_access(string $id,int $check,string $rel_path=null,int $user=null)
+ * 			'file_access_user' => false,			// true if file_access method supports 4th parameter $user, if app is NOT supporting it
+ *                                                  // egw_link::file_access() returns false for $user != current user!
  *			'find_extra'  => array('name_preg' => '/^(?!.picture.jpg)$/')	// extra options to egw_vfs::find, to eg. remove some files from the list of attachments
  *			'edit' => array(
  *				'menuaction' => 'app.class.method',
@@ -1234,32 +1236,46 @@ class egw_link extends solink
 	 * @param string $app app-name or null to delete the whole cache
 	 * @param int|string $id id or null to delete only file_access cache of given app (keeps title cache, if app implements file_access!)
 	 */
-	public static function delete_cache($app,$id)
+	private static function delete_cache($app,$id)
 	{
-		if (empty($app) || empty($id))
-		{
-			self::$file_access_cache = array();
-			if (empty($app) || !self::get_registry($app, 'file_access'))
-			{
-				self::$title_cache = array();
-			}
-		}
 		unset(self::$title_cache[$app.':'.$id]);
 		unset(self::$file_access_cache[$app.':'.$id]);
 	}
 
 	/**
-	 * Check the file access perms for $app/id
+	 * Check the file access perms for $app/id and given user $user
+	 *
+	 * If $user given and != current user AND app does not set file_access_user=true,
+	 * allways return false, as there's no way to check access for an other user!
 	 *
 	 * @ToDo $rel_path is not yet implemented, as no app use it currently
 	 * @param string $app
 	 * @param string|int $id id of entry
 	 * @param int $required=EGW_ACL_READ EGW_ACL_{READ|EDIT}
-	 * @param string $rel_path
-	 * @return boolean
+	 * @param string $rel_path=null
+	 * @param int $user=null default null = current user
+	 * @return boolean true if access granted, false otherwise
 	 */
-	static function file_access($app,$id,$required=EGW_ACL_READ,$rel_path=null)
+	static function file_access($app,$id,$required=EGW_ACL_READ,$rel_path=null,$user=null)
 	{
+		// are we called for an other user
+		if ($user && $user != self::$user)
+		{
+			// check if app supports file_access WITH 4th $user parameter --> return false if not
+			if (!self::get_registry($app,'file_access_user') || !($method = self::get_registry($app,'file_access')))
+			{
+				$ret = false;
+				$err = "(no file_access_user)";
+			}
+			else
+			{
+				$ret = ExecMethod2($method,$id,$required,$rel_path,$user);
+				$err = "(from $method)";
+			}
+			//error_log(__METHOD__."('$app',$id,$required,'$rel_path',$user) returning $err ".array2string($ret));
+			return $ret;
+		}
+
 		$cache =& self::get_cache($app,$id,'file_access');
 
 		if (!isset($cache) || $required == EGW_ACL_EDIT && !($cache & $required))
diff --git a/phpgwapi/inc/class.links_stream_wrapper.inc.php b/phpgwapi/inc/class.links_stream_wrapper.inc.php
index 2f503b9378..3e54991fed 100644
--- a/phpgwapi/inc/class.links_stream_wrapper.inc.php
+++ b/phpgwapi/inc/class.links_stream_wrapper.inc.php
@@ -59,26 +59,6 @@ class links_stream_wrapper extends links_stream_wrapper_parent
 	 */
 	const DEBUG = false;
 
-	/**
-	 * Clears our stat-cache
-	 *
-	 * Normaly not necessary, as it is automatically cleared/updated, UNLESS egw_vfs::$user changes!
-	 *
-	 * We have to clear file_access cache of egw_link, as our ACL depends on it!
-	 *
-	 * @param string $path='/apps' to be able to clear only file_access cache of a certain app
-	 */
-	public static function clearstatcache($path='/apps')
-	{
-		//error_log(__METHOD__."('$path')");
-		if ($path[0] != '/') $path = parse_url($path, PHP_URL_PATH);
-		list(,,$app) = explode('/',$path);
-		egw_link::delete_cache($app, null);	// null = delete only file_access cache, if app implements it, otherwise title cache is deleted too
-
-		// need to call sqlfs clearstatcache too
-		parent::clearstatcache($path);
-	}
-
 	/**
 	 * Implements ACL based on the access of the user to the entry the files are linked to.
 	 *
@@ -119,9 +99,9 @@ class links_stream_wrapper extends links_stream_wrapper_parent
 		{
 			// vfs & stream-wrapper use posix rights, egw_link::file_access uses EGW_ACL_{EDIT|READ}!
 			$required = $check & egw_vfs::WRITABLE ? EGW_ACL_EDIT : EGW_ACL_READ;
-			$access = egw_link::file_access($app,$id,$required,$rel_path);
+			$access = egw_link::file_access($app,$id,$required,$rel_path,egw_vfs::$user);
 		}
-		if (self::DEBUG) error_log(__METHOD__."($url,$check) ".($access?"access granted ($app:$id:$rel_path)":'no access!!!'));
+		if (self::DEBUG) error_log(__METHOD__."($url,$check) user={egw_vfs::$user} ".($access?"access granted ($app:$id:$rel_path)":'no access!!!'));
 		return $access;
 	}