diff --git a/dav/Changelog.txt b/dav/Changelog.txt
index 2a8304c8a..c336baa93 100644
--- a/dav/Changelog.txt
+++ b/dav/Changelog.txt
@@ -1,4 +1,6 @@
-v0.2.1
+v0.3
+[REFACTOR] The new version of the VObject Library is used
+[REFACTOR] The addressbook part has beed heavily refactored
 [REFACTOR] Remove some Friendica-specific code out of the "common"-folder
 
 v0.2.0
diff --git a/dav/common/calendar.fnk.php b/dav/common/calendar.fnk.php
index 10177b347..11f31f7de 100644
--- a/dav/common/calendar.fnk.php
+++ b/dav/common/calendar.fnk.php
@@ -7,7 +7,9 @@ define("DAV_DISPLAYNAME", "{DAV:}displayname");
 define("DAV_CALENDARCOLOR", "{http://apple.com/ns/ical/}calendar-color");
 
 
-class DAVVersionMismatchException extends Exception {}
+class DAVVersionMismatchException extends Exception
+{
+}
 
 
 class vcard_source_data_email
@@ -99,6 +101,48 @@ class vcard_source_data
 	public $photo;
 }
 
+/**
+ * @param vcard_source_data $vcardsource
+ * @return string
+ */
+function vcard_source_compile($vcardsource)
+{
+	$str = "BEGIN:VCARD\r\nVERSION:3.0\r\nPRODID:-//Friendica//DAV-Plugin//EN\r\n";
+	$str .= "N:" . str_replace(";", ",", $vcardsource->name_last) . ";" . str_replace(";", ",", $vcardsource->name_first) . ";" . str_replace(";", ",", $vcardsource->name_middle) . ";;\r\n";
+	$str .= "FN:" . str_replace(";", ",", $vcardsource->name_first) . " " . str_replace(";", ",", $vcardsource->name_middle) . " " . str_replace(";", ",", $vcardsource->name_last) . "\r\n";
+	$str .= "REV:" . str_replace(" ", "T", $vcardsource->last_update) . "Z\r\n";
+
+	$item_count = 0;
+	for ($i = 0; $i < count($vcardsource->homepages); $i++) {
+		if ($i == 0) $str .= "URL;type=" . $vcardsource->homepages[0]->type . ":" . $vcardsource->homepages[0]->homepage . "\r\n";
+		else {
+			$c = ++$item_count;
+			$str .= "item$c.URL;type=" . $vcardsource->homepages[0]->type . ":" . $vcardsource->homepages[0]->homepage . "\r\n";
+			$str .= "item$c.X-ABLabel:_\$!<HomePage>!\$_\r\n";
+		}
+	}
+
+	if (is_object($vcardsource->photo)) {
+		$data = base64_encode($vcardsource->photo->binarydata);
+		$str .= "PHOTO;ENCODING=BASE64;TYPE=" . $vcardsource->photo->type . ":" . $data . "\r\n";
+	}
+
+	if (isset($vcardsource->socialnetworks) && is_array($vcardsource->socialnetworks)) foreach ($vcardsource->socialnetworks as $netw) switch ($netw->type) {
+		case "dfrn":
+			$str .= "X-SOCIALPROFILE;type=dfrn;x-user=" . $netw->nick . ":" . $netw->url . "\r\n";
+			break;
+		case "facebook":
+			$str .= "X-SOCIALPROFILE;type=facebook;x-user=" . $netw->nick . ":" . $netw->url . "\r\n";
+			break;
+		case "twitter":
+			$str .= "X-SOCIALPROFILE;type=twitter;x-user=" . $netw->nick . ":" . $netw->url . "\r\n";
+			break;
+	}
+
+	$str .= "END:VCARD\r\n";
+	return $str;
+}
+
 
 /**
  * @param int $phpDate (UTC)
@@ -209,7 +253,7 @@ function dav_create_server($force_authentication = false, $needs_caldav = true,
 		$aclPlugin->defaultUsernamePath = "principals/users";
 		$server->addPlugin($aclPlugin);
 	} else {
-		$aclPlugin = new Sabre_DAVACL_Plugin();
+		$aclPlugin                      = new Sabre_DAVACL_Plugin();
 		$aclPlugin->defaultUsernamePath = "principals/users";
 		$server->addPlugin($aclPlugin);
 	}
diff --git a/dav/dav.php b/dav/dav.php
index 40040dfe2..f4d08f028 100644
--- a/dav/dav.php
+++ b/dav/dav.php
@@ -2,7 +2,7 @@
 /**
  * Name: Calendar with CalDAV Support
  * Description: A web-based calendar system with CalDAV-support. Also brings your Friendica-Contacts to your CardDAV-capable mobile phone. Requires PHP >= 5.3.
- * Version: 0.2.0
+ * Version: 0.3.0
  * Author: Tobias Hößl <https://github.com/CatoTH/>
  */
 
diff --git a/dav/friendica/database-init.inc.php b/dav/friendica/database-init.inc.php
index 5978fd01e..f91ddb259 100644
--- a/dav/friendica/database-init.inc.php
+++ b/dav/friendica/database-init.inc.php
@@ -44,10 +44,6 @@ function dav_get_update_statements($from_version)
 	}
 
 	if (in_array($from_version, array(1, 2))) {
-		$stms[] = "DROP TABLE `dav_addressbooks_phone`";
-		$stms[] = "DROP TABLE `dav_addressbooks_community`";
-		$stms[] = "DROP TABLE `dav_cards`";
-
 		$stms[] = "CREATE TABLE IF NOT EXISTS `dav_addressbooks` (
   `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
   `namespace` mediumint(9) NOT NULL,
@@ -228,8 +224,12 @@ function dav_check_tables()
 	$x = q("DESCRIBE %s%scalendars", CALDAV_SQL_DB, CALDAV_SQL_PREFIX);
 	if (!$x) return -1;
 	if (count($x) == 9) return 1; // Version 0.1
-	// @TODO Detect Version 0.2
+
+	$x2 = q("show tables like '%s%saddressbooks'", CALDAV_SQL_DB, CALDAV_SQL_PREFIX);
+	if (!$x2 || count($x2) == 0) return 2; // Version 0.2
+
 	if (count($x) == 12) return 0; // Correct
+
 	return -2; // Unknown version
 }
 
@@ -257,11 +257,10 @@ function dav_create_tables()
 function dav_upgrade_tables()
 {
 	$ver = dav_check_tables();
-	if (!in_array($ver, array(1))) return array("Unknown error");
-
+	if (!in_array($ver, array(1, 2))) return array("Unknown error");
 	$stms   = dav_get_update_statements($ver);
-	$errors = array();
 
+	$errors = array();
 	global $db;
 	foreach ($stms as $st) { // @TODO Friendica-dependent
 		$db->q($st);
diff --git a/dav/friendica/dav_carddav_backend_virtual_friendica.inc.php b/dav/friendica/dav_carddav_backend_virtual_friendica.inc.php
index 3d7e09745..3a06d042b 100644
--- a/dav/friendica/dav_carddav_backend_virtual_friendica.inc.php
+++ b/dav/friendica/dav_carddav_backend_virtual_friendica.inc.php
@@ -128,15 +128,15 @@ class Sabre_CardDAV_Backend_Friendica extends Sabre_CardDAV_Backend_Virtual
 	/**
 	 * @static
 	 * @param int $addressbookId
+	 * @param bool $force
 	 * @throws Sabre_DAV_Exception_NotFound
 	 */
-	static protected function createCache_internal($addressbookId) {
+	static protected function createCache_internal($addressbookId, $force = false) {
 		//$notin    = (count($exclude_ids) > 0 ? " AND id NOT IN (" . implode(", ", $exclude_ids) . ") " : "");
 		$addressbook = q("SELECT * FROM %s%saddressbooks WHERE `id` = %d", CALDAV_SQL_DB, CALDAV_SQL_PREFIX, IntVal($addressbookId));
 		if (count($addressbook) != 1 || $addressbook[0]["namespace"] != CARDDAV_NAMESPACE_PRIVATE) throw new Sabre_DAV_Exception_NotFound();
 		$contacts = q("SELECT * FROM `contact` WHERE `uid` = %d AND `blocked` = 0 AND `pending` = 0 AND `hidden` = 0 AND `archive` = 0 ORDER BY `name` ASC", $addressbook[0]["namespace_id"]);
 
-		$retdata = array();
 		foreach ($contacts as $contact) {
 			$x            = static::dav_contactarr2vcardsource($contact);
 			q("INSERT INTO %s%saddressbookobjects (`addressbook_id`, `contact`, `carddata`, `uri`, `lastmodified`, `etag`, `size`) VALUES (%d, %d, '%s', '%s', NOW(), '%s', %d)",
@@ -146,6 +146,27 @@ class Sabre_CardDAV_Backend_Friendica extends Sabre_CardDAV_Backend_Virtual
 	}
 
 
+	/**
+	 * @static
+	 * @param int $addressbookId
+	 * @param int $contactId
+	 * @param bool $force
+	 * @throws Sabre_DAV_Exception_NotFound
+	 */
+	static protected function createCardCache($addressbookId, $contactId, $force = false)
+	{
+		$addressbook = q("SELECT * FROM %s%saddressbooks WHERE `id` = %d", CALDAV_SQL_DB, CALDAV_SQL_PREFIX, IntVal($addressbookId));
+		if (count($addressbook) != 1 || $addressbook[0]["namespace"] != CARDDAV_NAMESPACE_PRIVATE) throw new Sabre_DAV_Exception_NotFound();
+
+		$contacts = q("SELECT * FROM `contact` WHERE `uid` = %d AND `blocked` = 0 AND `pending` = 0 AND `hidden` = 0 AND `archive` = 0 AND `id` = %d ORDER BY `name` ASC",
+			$addressbook[0]["namespace_id"], IntVal($contactId));
+		$contact = $contacts[0];
+
+		$x            = static::dav_contactarr2vcardsource($contact);
+		q("INSERT INTO %s%saddressbookobjects (`addressbook_id`, `contact`, `carddata`, `uri`, `lastmodified`, `etag`, `size`) VALUES (%d, %d, '%s', '%s', NOW(), '%s', %d)",
+			CALDAV_SQL_DB, CALDAV_SQL_PREFIX, $addressbookId, $contact["id"], dbesc($x["carddata"]), dbesc($x["uri"]), dbesc($x["etag"]), $x["size"]
+		);
+	}
 	/**
 	 * Updates a card.
 	 *
@@ -202,4 +223,5 @@ class Sabre_CardDAV_Backend_Friendica extends Sabre_CardDAV_Backend_Virtual
 
 		return true;
 	}
+
 }
diff --git a/dav/friendica/main.php b/dav/friendica/main.php
index 712b6c7b8..0fe939ebb 100644
--- a/dav/friendica/main.php
+++ b/dav/friendica/main.php
@@ -339,6 +339,7 @@ function dav_plugin_admin(&$a, &$o)
 			$o .= t('Installed');
 			break;
 		case 1:
+		case 2:
 			$o .= "<strong>" . t('Upgrade needed') . "</strong><br>" . t("Please back up all calendar data (the tables beginning with dav_*) before proceeding. While all calendar events <i>should</i> be converted to the new database structure, it's always safe to have a backup. Below, you can have a look at the database-queries that will be made when pressing the 'update'-button.") . "<br><br><input type='submit' name='upgrade' value='" . t('Upgrade') . "'>";
 			break;
 		case -1:
@@ -355,8 +356,8 @@ function dav_plugin_admin(&$a, &$o)
 	$o .= "<h4>" . t("Manual creation of the database tables:") . "</h4>";
 	$o .= "<a href='#' onClick='\$(\"#sqlstatements\").show(); return false;'>" . t("Show SQL-statements") . "</a><blockquote style='display: none;' id='sqlstatements'><pre>";
 	switch ($dbstatus) {
-		case 1:
-			$tables = dav_get_update_statements(1);
+		case 1: case 2:
+			$tables = dav_get_update_statements($dbstatus);
 			foreach ($tables as $t) $o .= escape_tags($t . ";\n\n");
 			break;
 		default: