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diff --git a/lib/private/connector/sabre/blocklegacyclientplugin.php b/lib/private/connector/sabre/blocklegacyclientplugin.php
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+++ b/lib/private/connector/sabre/blocklegacyclientplugin.php
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+<?php
+/**
+ * @author Lukas Reschke <lukas@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OC\Connector\Sabre;
+
+use OC\ServiceUnavailableException;
+use OCP\IConfig;
+use Sabre\HTTP\RequestInterface;
+use Sabre\DAV\ServerPlugin;
+use Sabre\DAV\Server;
+
+/**
+ * Class BlockLegacyClientPlugin is used to detect old legacy sync clients and
+ * returns a 503 status to those clients.
+ *
+ * @package OC\Connector\Sabre
+ */
+class BlockLegacyClientPlugin extends ServerPlugin {
+	/** @var Server */
+	protected $server;
+	/** @var IConfig */
+	protected $config;
+
+	/**
+	 * @param IConfig $config
+	 */
+	public function __construct(IConfig $config) {
+		$this->config = $config;
+	}
+
+	/**
+	 * @param Server $server
+	 * @return void
+	 */
+	public function initialize(Server  $server) {
+		$this->server = $server;
+		$this->server->on('beforeMethod', [$this, 'beforeHandler'], 200);
+	}
+
+	/**
+	 * Detects all unsupported clients and throws a ServiceUnavailableException
+	 * which will result in a 503 to them.
+	 * @param RequestInterface $request
+	 * @throws ServiceUnavailableException If the client version is not supported
+	 */
+	public function beforeHandler(RequestInterface $request) {
+		$userAgent = $request->getHeader('User-Agent');
+		$minimumSupportedDesktopVersion = $this->config->getSystemValue('minimum.supported.desktop.version', '1.7.0');
+
+		// Match on the mirall version which is in scheme "Mozilla/5.0 (%1) mirall/%2" or
+		// "mirall/%1" for older releases
+		preg_match("/(?:mirall\\/)([\d.]+)/i", $userAgent, $versionMatches);
+		if(isset($versionMatches[1]) &&
+			version_compare($versionMatches[1], $minimumSupportedDesktopVersion) === -1) {
+			throw new ServiceUnavailableException('Unsupported client version.');
+		}
+	}
+}