Try to work around issue on android with conflicts:

Ensure that any conflicts that result in server data overwritting
client data, have the server data send as a MODIFY element in
the same response as the conflict status code for the same message.

framework/ActiveSync/lib/Horde/ActiveSync/Collections.php

@@ -1134,18 +1134,41 @@ public function updatePingableFlag()
      * we are not PINGing.
      *
      * @param boolean $ping  True if this is a PING request, false otherwise.
+     * @param array $ensure  An array of UIDs that should be sent in the
+     *                       current response if possible, and not put off
+     *                       because of a MOREAVAILABLE situation.
      *
      * @return array  The changes array.
      */
-    public function getCollectionChanges($ping = false)
+    public function getCollectionChanges($ping = false, array $ensure = array())
     {
         if (empty($this->_changes)) {
             $this->_changes = $this->_as->state->getChanges(array('ping' => $ping));
         }
 
+        if (!empty($ensure)) {
+            $this->_changes = $this->_reorderChanges($ensure);
+        }
+
         return $this->_changes;
     }
 
+    protected function _reorderChanges(array $ensure)
+    {
+        $changes = array();
+        foreach ($this->_changes as $change) {
+            if (array_search($change['id'], $ensure) !== false) {
+                $this->_logger->info(sprintf(
+                    'Placing %s at beginning of changes array.', $change['id']));
+                array_unshift($changes, $change);
+            } else {
+                $changes[] = $change;
+            }
+        }
+
+        return $changes;
+    }
+
     /**
      * Return the count of the current collection's chagnes.
      *

framework/ActiveSync/lib/Horde/ActiveSync/Request/Sync.php

@@ -510,6 +510,7 @@ protected function _handle()
                     }
 
                     // Output any SYNC_MODIFY failures
+                    $ensure_sent = array();
                     if (!empty($collection['importfailures'])) {
                         foreach ($collection['importfailures'] as $id => $reason) {
                             $this->_encoder->startTag(Horde_ActiveSync::SYNC_MODIFY);
@@ -520,7 +521,14 @@ protected function _handle()
                             $this->_encoder->content($reason);
                             $this->_encoder->endTag();
                             $this->_encoder->endTag();
+                            // If we have a conflict, ensure we send the new server
+                            // data in the response, if possible. Some android
+                            // clients require this, or never accept the response.
+                            if ($reason == self::STATUS_CONFLICT) {
+                                $ensure_sent[] = $id;
+                            }
                         }
+
                     }
 
                     if (!empty($collection['fetchids'])) {
@@ -576,7 +584,7 @@ protected function _handle()
                     }
 
                     if (!empty($changecount)) {
-                        $exporter->setChanges($this->_collections->getCollectionChanges(), $collection);
+                        $exporter->setChanges($this->_collections->getCollectionChanges(false, $ensure_sent), $collection);
                         $this->_encoder->startTag(Horde_ActiveSync::SYNC_COMMANDS);
                         $cnt_collection = 0;
                         while ($cnt_collection < $collection['windowsize'] &&