diff --git a/appinfo/remote.php b/appinfo/remote.php
index e99e296b..9b11ce61 100644
--- a/appinfo/remote.php
+++ b/appinfo/remote.php
@@ -40,7 +40,7 @@ $principalBackend = new OC_Connector_Sabre_Principal();
 
 $addressbookbackends = array();
 $addressbookbackends[] = new OCA\Contacts\Backend\Database(\OCP\User::getUser());
-$carddavBackend = new OCA\Contacts\CardDAV\Backend(array('local', 'shared'));
+$carddavBackend = new OCA\Contacts\CardDAV\Backend(array('local', 'shared', 'ldap'));
 $requestBackend = new OC_Connector_Sabre_Request();
 
 // Root nodes
diff --git a/lib/app.php b/lib/app.php
index 36d6b95f..86be14d2 100644
--- a/lib/app.php
+++ b/lib/app.php
@@ -53,7 +53,7 @@ class App {
 	* @var array
 	*/
 	public static $backendClasses = array(
-		//'ldap' => 'OCA\Contacts\Backend\Ldap',
+		'ldap' => 'OCA\Contacts\Backend\Ldap',
 		'local' => 'OCA\Contacts\Backend\Database',
 		'shared' => 'OCA\Contacts\Backend\Shared',
 	);
diff --git a/lib/backend/abstractbackend.php b/lib/backend/abstractbackend.php
index 242f1ffe..475f0c5b 100644
--- a/lib/backend/abstractbackend.php
+++ b/lib/backend/abstractbackend.php
@@ -313,8 +313,8 @@ abstract class AbstractBackend {
 	 * @param VCard $contact
 	 * @param array $options - Optional options
 	 * @return string|bool The identifier for the new contact or false on error.
-	public function createContact($addressbookid, $contact, array $options = array());
 	 */
+	public abstract function createContact($addressbookid, $contact, array $options = array());
 
 	/**
 	 * Updates a contact
@@ -326,8 +326,8 @@ abstract class AbstractBackend {
 	 * @param VCard $contact
 	 * @param array $options - Optional options
 	 * @return bool
-	public function updateContact($addressbookid, $id, $carddata, array $options = array());
 	 */
+	public abstract function updateContact($addressbookid, $id, $carddata, array $options = array());
 
 	/**
 	 * Deletes a contact
@@ -338,8 +338,8 @@ abstract class AbstractBackend {
 	 * @param mixed $id
 	 * @param array $options - Optional options
 	 * @return bool
-	public function deleteContact($addressbookid, $id, array $options = array());
 	 */
+	public abstract function deleteContact($addressbookid, $id, array $options = array());
 
 	/**
 	 * @brief Get the last modification time for a contact.
@@ -414,7 +414,7 @@ abstract class AbstractBackend {
 		$key = 'prefs_' . $key;
 
 		$data = \OCP\Config::getUserValue($this->userid, 'contacts', $key, false);
-		return $data ? json_decode($data) : array();
+		return $data ? (array)json_decode($data) : array();
 	}
 	
 	/**
@@ -424,12 +424,34 @@ abstract class AbstractBackend {
 	 * @return boolean
 	 */
 	public function setPreferences($addressbookid, array $params) {
-		$key = $this->combinedKey($addressBookId);
+		$key = $this->combinedKey($addressbookid);
 		$key = 'prefs_' . $key;
+		
+		$addressbookList = $this->getAddressbookList($params);
+		if (!in_array($addressbookid, $addressbookList)) {
+			$addressbookList[] = $addressbookid;
+			$this->setAddressbookList($addressbookList, $params);
+		}
 
 		$data = json_encode($params);
 		return $data
 			? \OCP\Config::setUserValue($this->userid, 'contacts', $key, $data)
 			: false;
 	}
+	
+	protected function setAddressbookList(array $addressbookList, array $params) {
+		$key = $this->name . "_list";
+		$data = json_encode($addressbookList);
+		
+		return $data
+			? \OCP\Config::setUserValue($this->userid, 'contacts', $key, $data)
+			: false;
+	}
+	
+	protected function getAddressbookList() {
+		$key = $this->name . "_list";
+		$data = \OCP\Config::getUserValue($this->userid, 'contacts', $key, false);
+		
+		return $data ? json_decode($data) : array();
+	}
 }
diff --git a/lib/backend/ldap.php b/lib/backend/ldap.php
index a873cba7..89c402d3 100644
--- a/lib/backend/ldap.php
+++ b/lib/backend/ldap.php
@@ -257,27 +257,28 @@ class Ldap extends AbstractBackend {
 	 */
 	public function getAddressBooksForUser(array $options = array()) {
 
-		try {
+		/*try {
 			if(!isset(self::$preparedQueries['addressbooksforuser'])) {
 				$sql = 'SELECT `configkey` from *PREFIX*preferences where `configkey` like ?';
 				$configkeyPrefix = $this->name . "_%_uri";
 				self::$preparedQueries['addressbooksforuser'] = \OCP\DB::prepare($sql);
+				error_log("ca farte ? ".$sql." ".$configkeyPrefix);
 				$result = self::$preparedQueries['addressbooksforuser']->execute(array($configkeyPrefix));
 				if (\OC_DB::isError($result)) {
 					\OCP\Util::write('contacts', __METHOD__. 'DB error: ' . \OC_DB::getErrorMessage($result), \OCP\Util::ERROR);
 					return $this->addressbooks;
 				}
-				$this->addressbooks = array();
-				while($row = $result->fetchRow()) {
-					$id = str_replace("_uri", "", str_replace($this->name."_", "", $row['configkey']));
-					$this->addressbooks[] = self::getAddressBook($id);
-				}
-				return $this->addressbooks;
 			}
 		} catch(\Exception $e) {
 			\OC_Log::write('contacts', __METHOD__.' exception: ' . $e->getMessage(), \OCP\Util::ERROR);
 			return $this->addressbooks;
+		}*/
+		$addressbookidList = $this->getAddressbookList();
+		$this->addressbooks = array();
+		foreach($addressbookidList as $addressbookid) {
+			$this->addressbooks[] = self::getAddressBook($addressbookid);
 		}
+		return $this->addressbooks;
 		
 	}
 
@@ -304,11 +305,11 @@ class Ldap extends AbstractBackend {
 		$preferences = self::getPreferences($addressbookid);
 		if ($preferences != false) {
 			$current = array();
-			$current['id'] = $addressbookid;
-			$current['displayname'] = $preferences['displayname'];
-			$current['description'] = $preferences['description'];
+			$current['id'] = (string)$addressbookid;
+			$current['displayname'] = (string)$preferences['displayname'];
+			$current['description'] = (string)$preferences['description'];
 			$current['owner'] = $this->userid;
-			$current['uri'] = $preferences['uri'];
+			$current['uri'] = (string)$preferences['uri'];
 			$current['permissions'] = \OCP\PERMISSION_ALL;
       $current['lastmodified'] = self::lastModifiedAddressBook($addressbookid);
 			return $current;
@@ -431,7 +432,7 @@ class Ldap extends AbstractBackend {
 				//OCP\Util::writeLog('contacts_ldap', __METHOD__.' Connector OK', \OC_Log::DEBUG);
 				$info = self::ldapFindMultiple(
 					$this->ldapParams['ldapbasednsearch'],
-					'(objectclass=person)',
+					$this->ldapParams['ldapfilter'],
 					$this->connector->getLdapEntries(),
 					isset($options['offset']) ? $options['offset'] : null,
 					isset($options['limit']) ? $options['limit'] : null
@@ -583,6 +584,7 @@ class Ldap extends AbstractBackend {
 	 * @return bool
 	 */
 	public function updateContact($addressbookid, $id, $carddata, array $options = array()) {
+		error_log("goat power ! $addressbookid, $id, $carddata");
 		$vcard = \Sabre\VObject\Reader::read($carddata);
 		
 		if (!is_array($id)) {