diff --git a/core/Controller/LegacyShareController.php b/core/Controller/LegacyShareController.php
new file mode 100644
index 0000000000000..4b1c98ec26073
--- /dev/null
+++ b/core/Controller/LegacyShareController.php
@@ -0,0 +1,144 @@
+<?php
+/**
+ * @copyright Copyright (c) 2017 Bjoern Schiessle <bjoern@schiessle.org>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * 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
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+
+namespace OC\Core\Controller;
+
+
+use OCP\AppFramework\Controller;
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\JSONResponse;
+use OCP\IRequest;
+use OCP\IUserSession;
+use OCP\Share;
+use OCP\Share\IManager;
+use OCP\Share\IShare;
+
+/**
+ * Class LegacyShareController
+ *
+ * Implements a ajax call to send a link share by mail by creating a dedicated mail
+ * share
+ *
+ * This class is used to stay compatible with the ownCloud sync client.
+ * Can be removed as soon as compatibility is no longer required
+ *
+ * @package OC\Core\Controller
+ */
+class LegacyShareController extends Controller {
+
+	/** @var IManager */
+	private $shareManager;
+
+	/** @var IUserSession */
+	private $userSession;
+
+	/**
+	 * LegacyShareController constructor.
+	 *
+	 * @param string $appName
+	 * @param IRequest $request
+	 * @param IManager $shareManager
+	 * @param IUserSession $userSession
+	 */
+	public function __construct($appName, IRequest $request,
+								IManager $shareManager,
+								IUserSession $userSession) {
+		parent::__construct($appName, $request);
+		$this->shareManager = $shareManager;
+		$this->userSession = $userSession;
+	}
+
+	/**
+	 * @NoAdminRequired
+	 * @param string $action
+	 * @param string $toaddress
+	 * @param string $link
+	 * @return JSONResponse
+	 */
+	public function link2Mail($action, $toaddress, $link) {
+		if ($action !== 'email') {
+			return new JSONResponse([], Http::STATUS_GONE);
+		}
+
+		$recipients = $this->getEmailAddresses($toaddress);
+
+		try {
+			$token = $this->getTokenFromUrl($link);
+			$share = $this->shareManager->getShareByToken($token);
+			$this->checkPermissions($share);
+			$share->setShareType(Share::SHARE_TYPE_EMAIL);
+			foreach ($recipients as $to) {
+				$share->setSharedWith($to);
+				$this->shareManager->createShare($share);
+			}
+		} catch (\Exception $e) {
+			return new JSONResponse(['data' => ['message' => 'Failed to send link by mail']], Http::STATUS_BAD_REQUEST);
+		}
+		return new JSONResponse();
+	}
+
+	/**
+	 * exctract token from url
+	 *
+	 * @param string $url
+	 * @return string
+	 */
+	protected function getTokenFromUrl($url) {
+		$start = strrpos($url, '/') + 1;
+		$token = substr($url, $start);
+		return $token;
+	}
+
+	/**
+	 * seperate multiple email addresses by ','
+	 *
+	 * @param string $addresses
+	 * @return array
+	 */
+	protected function getEmailAddresses($addresses) {
+		return explode(',' , $addresses);
+	}
+
+	/**
+	 * check if the user has enough permission to send the share by mail
+	 *
+	 * @param IShare $share
+	 * @return bool
+	 * @throws \Exception
+	 */
+	protected function checkPermissions(IShare $share) {
+		$currentUser = $this->userSession->getUser();
+
+		if ($currentUser === null) {
+			throw new \Exception('no Permission to send share my mail');
+		}
+
+		$uid = $currentUser->getUID();
+
+		if ($share->getShareOwner() === $uid || $share->getSharedBy() === $uid) {
+			return true;
+		}
+
+		throw new \Exception('no Permission to send share my mail');
+	}
+
+}
diff --git a/core/routes.php b/core/routes.php
index 5d61d58e03795..cb64a72855b0f 100644
--- a/core/routes.php
+++ b/core/routes.php
@@ -56,6 +56,7 @@
 		['name' => 'Preview#getPreview', 'url' => '/core/preview', 'verb' => 'GET'],
 		['name' => 'Preview#getPreview', 'url' => '/core/preview.png', 'verb' => 'GET'],
 		['name' => 'Css#getCss', 'url' => '/css/{appName}/{fileName}', 'verb' => 'GET'],
+		['name' => 'LegacyShare#link2Mail', 'url' => '/core/ajax/share.php', 'verb' => 'POST'],
 	],
 	'ocs' => [
 		['root' => '/cloud', 'name' => 'OCS#getCapabilities', 'url' => '/capabilities', 'verb' => 'GET'],