It took me a long time to find this solution (which worked perfectly), so I'm going to do my part to focus the rest of the Internet that direction. These instructions worked perfectly to get SQL Server conectivity going for PHP 5.5 (x86), on WIndows 7 x64, running Apache (XAMPP). http://robsphp.blogspot.com/2012/09/how-to-install-microsofts-sql-serve…