diff --git a/plugins/calendar/drivers/kolab/kolab_driver.php b/plugins/calendar/drivers/kolab/kolab_driver.php
index 653a3b89..62f34b8c 100644
--- a/plugins/calendar/drivers/kolab/kolab_driver.php
+++ b/plugins/calendar/drivers/kolab/kolab_driver.php
@@ -563,7 +563,6 @@ class kolab_driver extends calendar_driver
           return false;
 
         $fromcalendar = $storage;
-        $storage->storage->synchronize();
       }
     }
     else
diff --git a/plugins/libkolab/lib/kolab_format.php b/plugins/libkolab/lib/kolab_format.php
index c72f9ac3..42ecaab8 100644
--- a/plugins/libkolab/lib/kolab_format.php
+++ b/plugins/libkolab/lib/kolab_format.php
@@ -75,7 +75,9 @@ abstract class kolab_format
             if (!$dateonly)
                 $result->setTime($datetime->format('G'), $datetime->format('i'), $datetime->format('s'));
 
-            if ($tz)
+            if ($tz && $tz->getName() == 'UTC')
+                $result->setUTC(true);
+            else if ($tz)
                 $result->setTimezone($tz->getName());
         }
 
@@ -101,6 +103,9 @@ abstract class kolab_format
                 $tz = new DateTimeZone($tzs);
                 $d->setTimezone($tz);
             }
+            else if ($cdt->isUTC()) {
+                $d->setTimezone(new DateTimeZone('UTC'));
+            }
         }
         catch (Exception $e) { }
 
diff --git a/plugins/libkolab/lib/kolab_format_event.php b/plugins/libkolab/lib/kolab_format_event.php
index f3de4252..97718ef4 100644
--- a/plugins/libkolab/lib/kolab_format_event.php
+++ b/plugins/libkolab/lib/kolab_format_event.php
@@ -262,7 +262,7 @@ class kolab_format_event extends kolab_format
             }
 
             if (preg_match('/^@(\d+)/', $offset, $d)) {
-                $alarm->setStart(self::get_datetime($d[1]));
+                $alarm->setStart(self::get_datetime($d[1], new DateTimeZone('UTC')));
             }
             else if (preg_match('/^([-+]?)(\d+)([SMHDW])/', $offset, $d)) {
                 $days = $hours = $minutes = $seconds = 0;
diff --git a/plugins/libkolab/lib/kolab_storage_folder.php b/plugins/libkolab/lib/kolab_storage_folder.php
index fa2d697b..bf83f64f 100644
--- a/plugins/libkolab/lib/kolab_storage_folder.php
+++ b/plugins/libkolab/lib/kolab_storage_folder.php
@@ -486,6 +486,33 @@ class kolab_storage_folder
     }
 
 
+    /**
+     * Move a Kolab object message to another IMAP folder
+     *
+     * @param string Object UID
+     * @param string IMAP folder to move object to
+     * @return boolean True on success, false on failure
+     */
+    public function move($uid, $target_folder)
+    {
+        if ($msguid = $this->uid2msguid($uid)) {
+            if ($success = $this->imap->move_message($msguid, $target_folder, $this->name)) {
+                // TODO: update cache
+                return true;
+            }
+            else {
+                raise_error(array(
+                    'code' => 600, 'type' => 'php',
+                    'file' => __FILE__, 'line' => __LINE__,
+                    'message' => "Failed to move message $msguid to $target_folder: " . $this->imap->get_error_str(),
+                ), true);
+            }
+        }
+
+        return false;
+    }
+
+
     /**
      * Resolve an object UID into an IMAP message UID
      */