Requirement
===============================================
PHP version greater than 5.1.2
PHP extensions: 
    pdo,
    pdo_mysql, 
    curl, 
    gd, 
    simpleXML, 
    ioncube_loader( optional to run encoded apps )

Apache version greater than 2.0
Apache modules: 
    mod_rewrite, 
    mod_expires

MySQL version greater than 5.0

Linux/Unix operation system
About OS, Cronjob, Backup required some system command or feature to works, if it has to run on Windows platform , don't worry the system general features will still functional.