You're likely to run into an error similar to the following.
Call to undefined function mysql_free_result() in E:\kunden\homepages\19\<your user id>\www\mysite\wp-includes\wp-db.php on line 1126Edit the file wordpress-root-dir\wp-includes\wp-db.php look for the following code block:
Comment both lines out otherwise mysql_free_result will always return an error:
if ( is_resource( $this->result ) )
mysql_free_result( $this->result );
Leave everything else in the function as is, including the closing curly brace "}" on the line below.
//if ( is_resource( $this->result ) )
//mysql_free_result( $this->result );
If you encountered this error while running install.php you will need to login to the MSSQL admin panel, delete the tables that were created by the WordPress install.php script and re-run install.php.