diff --git a/framework/db/mssql/PDO.php b/framework/db/mssql/PDO.php
deleted file mode 100644
index e045d68..0000000
--- a/framework/db/mssql/PDO.php
+++ /dev/null
@@ -1,68 +0,0 @@
-<?php
-/**
- * @link http://www.yiiframework.com/
- * @copyright Copyright (c) 2008 Yii Software LLC
- * @license http://www.yiiframework.com/license/
- */
-
-namespace yii\db\mssql;
-
-/**
- * This is an extension of default PDO class for MSSQL and DBLIB drivers. It provides workaround for improperly
- * implemented functionalities of the drivers.
- *
- * @author Timur Ruziev <qiang.xue@gmail.com>
- * @since 2.0
- */
-class PDO extends \PDO
-{
-	/**
-	 * Returns last inserted ID value.
-	 *
-	 * @param string|null sequence the sequence name. Defaults to null.
-	 * @return integer last inserted ID value.
-	 */
-	public function lastInsertId($sequence = null)
-	{
-		return $this->query('SELECT CAST(COALESCE(SCOPE_IDENTITY(), @@IDENTITY) AS bigint)')->fetchColumn();
-	}
-
-	/**
-	 * Begin a transaction.
-	 *
-	 * Is is necessary to override PDO's method as MSSQL PDO drivers does not support transactions.
-	 *
-	 * @return boolean
-	 */
-	public function beginTransaction()
-	{
-		$this->exec('BEGIN TRANSACTION');
-		return true;
-	}
-
-	/**
-	 * Commit a transaction.
-	 *
-	 * Is is necessary to override PDO's method as MSSQL PDO drivers does not support transactions.
-	 *
-	 * @return boolean
-	 */
-	public function commit()
-	{
-		$this->exec('COMMIT TRANSACTION');
-		return true;
-	}
-
-	/**
-	 * Rollback a transaction.
-	 *
-	 * Is is necessary to override PDO's method as MSSQL PDO drivers does not support transaction.
-	 *
-	 * @return boolean
-	 */
-	public function rollBack()
-	{
-		$this->exec('ROLLBACK TRANSACTION');
-		return true;
-	}
-}
diff --git a/framework/db/mssql/QueryBuilder.php b/framework/db/mssql/QueryBuilder.php
deleted file mode 100644
index 988758b..0000000
--- a/framework/db/mssql/QueryBuilder.php
+++ /dev/null
@@ -1,19 +0,0 @@
-<?php
-/**
- * @link http://www.yiiframework.com/
- * @copyright Copyright (c) 2008 Yii Software LLC
- * @license http://www.yiiframework.com/license/
- */
-
-namespace yii\db\mssql;
-
-/**
- * QueryBuilder is the query builder for MS SQL databases.
- *
- * @author Timur Ruziev <resurtm@gmail.com>
- * @since 2.0
- */
-class QueryBuilder extends \yii\db\QueryBuilder
-{
-	// TODO: mssql driver
-}
diff --git a/framework/db/mssql/Schema.php b/framework/db/mssql/Schema.php
deleted file mode 100644
index 8fc8aea..0000000
--- a/framework/db/mssql/Schema.php
+++ /dev/null
@@ -1,93 +0,0 @@
-<?php
-/**
- * @link http://www.yiiframework.com/
- * @copyright Copyright (c) 2008 Yii Software LLC
- * @license http://www.yiiframework.com/license/
- */
-
-namespace yii\db\mssql;
-
-use yii\db\TableSchema;
-
-/**
- * Schema is the class for retrieving metadata from a MS SQL database (version 2008 and above).
- *
- * @author Timur Ruziev <qiang.xue@gmail.com>
- * @since 2.0
- */
-class Schema extends \yii\db\Schema
-{
-	/**
-	 * Default schema name to be used.
-	 */
-	const DEFAULT_SCHEMA = 'dbo';
-
-	/**
-	 * @var array mapping from physical column types (keys) to abstract column types (values)
-	 */
-	public $typeMap = array(
-		// TODO: mssql driver
-	);
-
-	/**
-	 * @param string $name
-	 * @return TableSchema
-	 */
-	public function loadTableSchema($name)
-	{
-		return null;
-	}
-
-	/**
-	 * Quotes a table name for use in a query.
-	 * A simple table name has no schema prefix.
-	 * @param string $name table name.
-	 * @return string the properly quoted table name.
-	 */
-	public function quoteSimpleTableName($name)
-	{
-		return strpos($name, '[') !== false ? $name : '[' . $name . ']';
-	}
-
-	/**
-	 * Quotes a column name for use in a query.
-	 * A simple column name has no prefix.
-	 * @param string $name column name.
-	 * @return string the properly quoted column name.
-	 */
-	public function quoteSimpleColumnName($name)
-	{
-		return strpos($name, '[') !== false || $name === '*' ? $name : '[' . $name . ']';
-	}
-
-	/**
-	 * Creates a query builder for the MSSQL database.
-	 * @return QueryBuilder query builder interface.
-	 */
-	public function createQueryBuilder()
-	{
-		return new QueryBuilder($this->db);
-	}
-
-	/**
-	 * Returns all table names in the database.
-	 * This method should be overridden by child classes in order to support this feature
-	 * because the default implementation simply throws an exception.
-	 * @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema.
-	 * @return array all table names in the database. The names have NO the schema name prefix.
-	 */
-	protected function findTableNames($schema = '')
-	{
-		if ('' === $schema) {
-			$schema = self::DEFAULT_SCHEMA;
-		}
-		$sql = "SELECT TABLE_NAME FROM [INFORMATION_SCHEMA].[TABLES] WHERE TABLE_SCHEMA = :schema AND TABLE_TYPE = 'BASE TABLE'";
-		$names = $this->db->createCommand($sql, array(':schema' => $schema))->queryColumn();
-		if (self::DEFAULT_SCHEMA !== $schema) {
-			foreach ($names as $index => $name) {
-				$names[$index] = $schema . '.' . $name;
-			}
-		}
-		return $names;
-	}
-}
diff --git a/framework/db/mssql/SqlsrvPDO.php b/framework/db/mssql/SqlsrvPDO.php
deleted file mode 100644
index 607d0e4..0000000
--- a/framework/db/mssql/SqlsrvPDO.php
+++ /dev/null
@@ -1,33 +0,0 @@
-<?php
-/**
- * @link http://www.yiiframework.com/
- * @copyright Copyright (c) 2008 Yii Software LLC
- * @license http://www.yiiframework.com/license/
- */
-
-namespace yii\db\mssql;
-
-/**
- * This is an extension of default PDO class for MSSQL SQLSRV driver. It provides workaround for improperly
- * implemented functionalities of the PDO SQLSRV driver.
- *
- * @author Timur Ruziev <resurtm@gmail.com>
- * @since 2.0
- */
-class SqlsrvPDO extends \PDO
-{
-	/**
-	 * Returns last inserted ID value.
-	 *
-	 * SQLSRV driver supports PDO::lastInsertId() with one peculiarity: when $sequence value is null
-	 * or empty string it returns empty string. But when parameter is not specified it's working
-	 * as expected and returns actual last inserted ID (like the other PDO drivers).
-	 *
-	 * @param string|null $sequence the sequence name. Defaults to null.
-	 * @return integer last inserted ID value.
-	 */
-	public function lastInsertId($sequence = null)
-	{
-		return !$sequence ? parent::lastInsertId() : parent::lastInsertId($sequence);
-	}
-}