I got hired by a company which plans to create their site in drupal. They have Windows 2012 server with IIS, I found out Mysql 5.6 and php 5.4 goes with it. Question is, should i install the non-thread safe version or thread safe version of php? i dont know what is this and the 2nd question is, what is this PDO for? do i have to install and enable it in the webserver or in the database server. Somebody please help me out.