diff --git a/lib/kolab_sync_data_calendar.php b/lib/kolab_sync_data_calendar.php
--- a/lib/kolab_sync_data_calendar.php
+++ b/lib/kolab_sync_data_calendar.php
@@ -185,6 +185,7 @@
         $config = $this->getFolderConfig($event['_mailbox']);
         $result = array();
         $is_outlook   = stripos($this->device->devicetype, 'outlook') !== false;
+        $is_android   = stripos($this->device->devicetype, 'android') !== false;
 
         // Kolab Format 3.0 and xCal does support timezone per-date, but ActiveSync allows
         // only one timezone per-event. We'll use timezone of the start date
@@ -317,7 +318,7 @@
                     $resp_type = $status ?: self::ATTENDEE_STATUS_UNKNOWN;
 
                     // Synchronize the attendee status to the event status to get the same behaviour as outlook.
-                    if ($is_outlook && isset($attendee['status'])) {
+                    if (($is_outlook || $is_android )&& isset($attendee['status'])) {
                         if ($attendee['status'] == 'ACCEPTED') {
                             $result['busyStatus'] = self::BUSY_STATUS_BUSY;
                         }
@@ -388,6 +389,7 @@
         $is_exception = $data instanceof Syncroton_Model_EventException;
         $dummy_tz     = str_repeat('A', 230) . '==';
         $is_outlook   = stripos($this->device->devicetype, 'outlook') !== false;
+        $is_android   = stripos($this->device->devicetype, 'android') !== false;
 
         // check data validity
         $this->check_event($data);
@@ -462,7 +464,7 @@
             case 'free_busy':
                 // Outlook sets the busy state to the attendance state, and we don't want to change the event state based on that.
                 // Outlook doesn't have the concept of an event state, so we just ignore this.
-                if ($is_outlook) {
+                if ($is_outlook || $is_android) {
                     continue 2;
                 }
                 $map   = array_flip($this->busyStatusMap);
@@ -573,7 +575,7 @@
         }
 
         // Outlook does not send the correct attendee status when changing between accepted and tentative, but it toggles the busyStatus.
-        if ($is_outlook) {
+        if ($is_outlook || $is_android) {
             $status = null;
             if ($data->busyStatus == self::BUSY_STATUS_BUSY) {
                 $status = "ACCEPTED";