diff --git a/plugins/calendar/drivers/kolab/kolab_driver.php b/plugins/calendar/drivers/kolab/kolab_driver.php
index dfdc00d9..01d6f45e 100644
--- a/plugins/calendar/drivers/kolab/kolab_driver.php
+++ b/plugins/calendar/drivers/kolab/kolab_driver.php
@@ -1021,17 +1021,12 @@ class kolab_driver extends calendar_driver
 
             $old = $fromcalendar->get_event($event['id']);
 
-            if ($event['_savemode'] != 'new') {
+            if (empty($event['_savemode']) || $event['_savemode'] != 'new') {
                 if (!$fromcalendar->storage->move($old['uid'], $storage->storage)) {
                     return false;
                 }
-
-                $fromcalendar = $storage;
             }
         }
-        else {
-            $fromcalendar = $storage;
-        }
 
         $success  = false;
         $savemode = 'all';
diff --git a/plugins/libkolab/lib/kolab_dav_client.php b/plugins/libkolab/lib/kolab_dav_client.php
index 1db25549..8471da02 100644
--- a/plugins/libkolab/lib/kolab_dav_client.php
+++ b/plugins/libkolab/lib/kolab_dav_client.php
@@ -359,10 +359,10 @@ class kolab_dav_client
             . '</d:propfind>';
 
         // Note: Cyrus CardDAV service requires Depth:1 (CalDAV works without it)
-        $response = $this->request($location, 'PROPFIND', $body, ['Depth' => 1, 'Prefer' => 'return-minimal']);
+        $response = $this->request($location, 'PROPFIND', $body, ['Depth' => 0, 'Prefer' => 'return-minimal']);
 
         if (!empty($response)
-            && ($element = $response->getElementsByTagName('response'))
+            && ($element = $response->getElementsByTagName('response')->item(0))
             && ($folder = $this->getFolderPropertiesFromResponse($element))
         ) {
             return $folder;
diff --git a/plugins/libkolab/lib/kolab_storage_cache.php b/plugins/libkolab/lib/kolab_storage_cache.php
index a559d7cf..353b044f 100644
--- a/plugins/libkolab/lib/kolab_storage_cache.php
+++ b/plugins/libkolab/lib/kolab_storage_cache.php
@@ -920,6 +920,14 @@ class kolab_storage_cache
         return $count;
     }
 
+    /**
+     * Reset the sync state, i.e. force sync when synchronize() is called again
+     */
+    public function reset()
+    {
+        $this->synched = null;
+    }
+
     /**
      * Define ORDER BY clause for cache queries
      */
diff --git a/plugins/libkolab/lib/kolab_storage_dav.php b/plugins/libkolab/lib/kolab_storage_dav.php
index e71f3d0d..c8accfc3 100644
--- a/plugins/libkolab/lib/kolab_storage_dav.php
+++ b/plugins/libkolab/lib/kolab_storage_dav.php
@@ -38,14 +38,6 @@ class kolab_storage_dav
     public function __construct($url)
     {
         $this->url = $url;
-        $this->setup();
-    }
-
-    /**
-     * Setup the environment
-     */
-    public function setup()
-    {
         $this->dav = new kolab_dav_client($this->url);
     }
 
@@ -58,7 +50,6 @@ class kolab_storage_dav
      */
     public function get_folders($type)
     {
-        // TODO: This should be cached
         $folders = $this->dav->listFolders($this->get_dav_type($type));
 
         if (is_array($folders)) {
diff --git a/plugins/libkolab/lib/kolab_storage_dav_folder.php b/plugins/libkolab/lib/kolab_storage_dav_folder.php
index 1e51f041..02efa686 100644
--- a/plugins/libkolab/lib/kolab_storage_dav_folder.php
+++ b/plugins/libkolab/lib/kolab_storage_dav_folder.php
@@ -24,10 +24,16 @@
 #[AllowDynamicProperties]
 class kolab_storage_dav_folder extends kolab_storage_folder
 {
+    /** @var kolab_dav_client DAV Client */
     public $dav;
+
+    /** @var string Folder URL */
     public $href;
+
+    /** @var array Folder DAV attributes */
     public $attributes;
 
+
     /**
      * Object constructor
      */
@@ -76,6 +82,13 @@ class kolab_storage_dav_folder extends kolab_storage_folder
      */
     public function get_ctag()
     {
+        // Refresh requested, get the current CTag from the DAV server
+        if ($this->attributes['ctag'] === false) {
+            if ($fresh = $this->dav->folderInfo($this->href)) {
+                $this->attributes['ctag'] = $fresh['ctag'];
+            }
+        }
+
         return $this->attributes['ctag'];
     }
 
@@ -330,6 +343,8 @@ class kolab_storage_dav_folder extends kolab_storage_folder
 
         if ($success) {
             $this->cache->set($uid, false);
+            $target_folder->reset();
+            $this->reset();
         }
 
         return $success;
@@ -462,6 +477,15 @@ class kolab_storage_dav_folder extends kolab_storage_folder
         return $uids;
     }
 
+    /**
+     * Reset the folder status
+     */
+    public function reset()
+    {
+        $this->cache->reset();
+        $this->attributes['ctag'] = false;
+    }
+
     /**
      * Convert DAV object into PHP array
      *
diff --git a/plugins/libkolab/lib/kolab_storage_folder.php b/plugins/libkolab/lib/kolab_storage_folder.php
index 56abbf21..4a30b8ba 100644
--- a/plugins/libkolab/lib/kolab_storage_folder.php
+++ b/plugins/libkolab/lib/kolab_storage_folder.php
@@ -265,6 +265,25 @@ class kolab_storage_folder extends kolab_storage_folder_api
         return $this->cache->count($this->_prepare_query($query));
     }
 
+    /**
+     * Getter for a single Kolab object identified by its UID
+     *
+     * @param string $uid Object UID
+     *
+     * @return array The Kolab object represented as hash array
+     */
+    public function get_object($uid)
+    {
+        if (!$this->valid || !$uid) {
+            return false;
+        }
+
+        // synchronize caches
+        $this->cache->synchronize();
+
+        return $this->cache->get_by_uid($uid);
+    }
+
     /**
      * List Kolab objects matching the given query
      *
@@ -365,25 +384,6 @@ class kolab_storage_folder extends kolab_storage_folder_api
         return $query;
     }
 
-    /**
-     * Getter for a single Kolab object identified by its UID
-     *
-     * @param string $uid Object UID
-     *
-     * @return array The Kolab object represented as hash array
-     */
-    public function get_object($uid)
-    {
-        if (!$this->valid || !$uid) {
-            return false;
-        }
-
-        // synchronize caches
-        $this->cache->synchronize();
-
-        return $this->cache->get_by_uid($uid);
-    }
-
     /**
      * Fetch a Kolab object attachment which is stored in a separate part
      * of the mail MIME message that represents the Kolab record.