* Apache with mod-rewrite enabled and "Options All" so you can use a local .htaccess file
* PHP 5.4+.
* PHP *command line* access with register_argc_argv set to true in the php.ini file
-* curl, gd, mysql, hash and openssl extensions
+* Curl, GD, PDO, MySQLi, hash and OpenSSL extensions
* some form of email server or email gateway such that PHP mail() works
-* mcrypt (optional; used for server-to-server message encryption)
* Mysql 5.5.3+ or an equivalant alternative for MySQL (MariaDB, Percona Server etc.)
* the ability to schedule jobs with cron (Linux/Mac) or Scheduled Tasks (Windows) (Note: other options are presented in Section 7 of this document.)
* Installation into a top-level domain or sub-domain (without a directory/path component in the URL) is preferred. Directory paths will not be as convenient to use and have not been thoroughly tested.