--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/program/lib/Roundcube/rcube_db_sqlsrv.php	Thu Jan 04 15:52:31 2018 -0500
@@ -0,0 +1,57 @@
+<?php
+
+/**
+ +-----------------------------------------------------------------------+
+ | This file is part of the Roundcube Webmail client                     |
+ | Copyright (C) 2005-2012, The Roundcube Dev Team                       |
+ |                                                                       |
+ | Licensed under the GNU General Public License version 3 or            |
+ | any later version with exceptions for skins & plugins.                |
+ | See the README file for a full license statement.                     |
+ |                                                                       |
+ | PURPOSE:                                                              |
+ |   Database wrapper class that implements PHP PDO functions            |
+ |   for MS SQL Server database                                          |
+ +-----------------------------------------------------------------------+
+ | Author: Aleksander Machniak <alec@alec.pl>                            |
+ +-----------------------------------------------------------------------+
+*/
+
+/**
+ * Database independent query interface
+ * This is a wrapper for the PHP PDO
+ *
+ * @package    Framework
+ * @subpackage Database
+ */
+class rcube_db_sqlsrv extends rcube_db_mssql
+{
+    /**
+     * Returns PDO DSN string from DSN array
+     */
+    protected function dsn_string($dsn)
+    {
+        $params = array();
+        $result = 'sqlsrv:';
+
+        if ($dsn['hostspec']) {
+            $host = $dsn['hostspec'];
+
+            if ($dsn['port']) {
+                $host .= ',' . $dsn['port'];
+            }
+
+            $params[] = 'Server=' . $host;
+        }
+
+        if ($dsn['database']) {
+            $params[] = 'Database=' . $dsn['database'];
+        }
+
+        if (!empty($params)) {
+            $result .= implode(';', $params);
+        }
+
+        return $result;
+    }
+}