diff --git a/addressbook/inc/class.addressbook_groupdav.inc.php b/addressbook/inc/class.addressbook_groupdav.inc.php
index 706ddd3820..ab82b3e01b 100644
--- a/addressbook/inc/class.addressbook_groupdav.inc.php
+++ b/addressbook/inc/class.addressbook_groupdav.inc.php
@@ -521,9 +521,7 @@ class addressbook_groupdav extends groupdav_handler
 		// not showing addressbook of a single user?
 		if (!$user || $path == '/addressbook/') $user = null;
 
-		$ctag = $this->bo->get_ctag($user);
-
-		return 'EGw-'.$ctag.'-wGE';
+		return $this->bo->get_ctag($user);
 	}
 
 	/**
diff --git a/calendar/inc/class.calendar_groupdav.inc.php b/calendar/inc/class.calendar_groupdav.inc.php
index a34ffb5fe0..ee1cf0aaf6 100644
--- a/calendar/inc/class.calendar_groupdav.inc.php
+++ b/calendar/inc/class.calendar_groupdav.inc.php
@@ -982,7 +982,7 @@ class calendar_groupdav extends groupdav_handler
 
 		if ($this->debug > 1) error_log(__FILE__.'['.__LINE__.'] '.__METHOD__. "($path)[$user] = $ctag");
 
-		return 'EGw-'.$ctag.'-wGE';
+		return $ctag;
 	}
 
 	/**
@@ -996,7 +996,7 @@ class calendar_groupdav extends groupdav_handler
 		$etag = $this->bo->get_etag($entry,$this->client_shared_uid_exceptions);
 
 		//error_log(__METHOD__ . "($entry[id] ($entry[etag]): $entry[title] --> etag=$etag");
-		return 'EGw-'.$etag.'-wGE';
+		return $etag;
 	}
 
 	/**
diff --git a/infolog/inc/class.infolog_groupdav.inc.php b/infolog/inc/class.infolog_groupdav.inc.php
index b00093c9e5..0b543b8a63 100644
--- a/infolog/inc/class.infolog_groupdav.inc.php
+++ b/infolog/inc/class.infolog_groupdav.inc.php
@@ -575,7 +575,7 @@ class infolog_groupdav extends groupdav_handler
 		{
 			return false;
 		}
-		return 'EGw-'.$info['info_id'].':'.$info['info_datemodified'].'-wGE';
+		return $info['info_id'].':'.$info['info_datemodified'];
 	}
 
 	/**
diff --git a/phpgwapi/inc/class.groupdav.inc.php b/phpgwapi/inc/class.groupdav.inc.php
index 0221ff37d3..06f4e1542e 100644
--- a/phpgwapi/inc/class.groupdav.inc.php
+++ b/phpgwapi/inc/class.groupdav.inc.php
@@ -419,7 +419,7 @@ class groupdav extends HTTP_WebDAV_Server
 		// required props per WebDAV standard
 		foreach(array(
 			'displayname'      => basename($path),
-			'getetag'          => 'EGw-no-etag-wGE',
+			'getetag'          => 'none',
 			'getcontentlength' => '',
 			'getlastmodified'  => '',
 			'getcontenttype'   => '',
@@ -716,8 +716,6 @@ class groupdav extends HTTP_WebDAV_Server
 					groupdav::CALENDARSERVER,'getctag',$handler->getctag($path,$user));
 			}
 		}
-		$props['getetag'] = 'EGw-'.$app.'-wGE';
-
 		if ($handler) $privileges = $handler->current_user_privileges($path.$app.'/', $user) ;
 
 		return $this->add_collection($path.$app.'/', $props, $privileges);
diff --git a/phpgwapi/inc/class.groupdav_handler.inc.php b/phpgwapi/inc/class.groupdav_handler.inc.php
index 2db624861b..115f6a9af6 100644
--- a/phpgwapi/inc/class.groupdav_handler.inc.php
+++ b/phpgwapi/inc/class.groupdav_handler.inc.php
@@ -217,7 +217,7 @@ abstract class groupdav_handler
 		//	error_log(__METHOD__."(".array2string($entry).") Cant create etag!");
 			return false;
 		}
-		return 'EGw-'.$entry['id'].':'.(isset($entry['etag']) ? $entry['etag'] : $entry['modified']).'-wGE';
+		return $entry['id'].':'.(isset($entry['etag']) ? $entry['etag'] : $entry['modified']);
 	}
 
 	/**
diff --git a/phpgwapi/inc/class.groupdav_principals.inc.php b/phpgwapi/inc/class.groupdav_principals.inc.php
index 4c2483c048..dfad8e9ef5 100644
--- a/phpgwapi/inc/class.groupdav_principals.inc.php
+++ b/phpgwapi/inc/class.groupdav_principals.inc.php
@@ -893,7 +893,7 @@ class groupdav_principals extends groupdav_handler
 		return $this->add_principal($principal.'/'.$type, array(
 				'displayname' => $app.' '.$what.' proxy of '.basename($principal),
 				'group-member-set' => $this->principal_set('group-member-set', $proxys),
-				'getetag' => 'EGw-'.md5(serialize($proxys)).'-wGE',
+				'getetag' => md5(serialize($proxys)),
 				'resourcetype' => array(HTTP_WebDAV_Server::mkprop(groupdav::CALENDARSERVER, $type, '')),
 			));
 	}
@@ -1040,12 +1040,12 @@ class groupdav_principals extends groupdav_handler
 		{
 			$account = $this->read($account);
 		}
-		return 'EGw-'.$account['account_id'].':'.md5(serialize($account)).
+		return $account['account_id'].':'.md5(serialize($account)).
 			// add md5 from calendar grants, as they are listed as memberships
 			':'.md5(serialize($this->acl->get_grants('calendar', true, $account['account_id']))).
 			// as the principal of current user is influenced by GroupDAV prefs, we have to include them in the etag
 			($account['account_id'] == $GLOBALS['egw_info']['user']['account_id'] ?
-				':'.md5(serialize($GLOBALS['egw_info']['user']['preferences']['groupdav'])) : '').'-wGE';
+				':'.md5(serialize($GLOBALS['egw_info']['user']['preferences']['groupdav'])) : '');
 	}
 
 	/**