Yii connect to MS SQL Server

1. Dowload Drivers and DLL for PHP http://msdn.microsoft.com/en-us/library/cc296170.aspx
2. Edit php.ini enable extension
3. Edit config/main.php db connection string 

              'db' => array(

                   'connectionString' => 'sqlsrv:Server=tcp:123.345.444.333;Database=myDB',

                   'username' => 'username',

                   'password' => 'password',

               ),