PDO, pdo_mysql, curl (version 7.10.5 or later), openssl (version 0.9.6 or later), ldap, mcrypt, gmp, json, imap, libxml, zlib, and simplexml PHP extensions
MySQL version 5.0 or later
Apache, IIS, or LiteSpeed Web Server
ionCube PHP loader
memory_limit set to 32 MB or greater
Every effort is made to stay within the above requirements in the extensions that ship with Blesta, however certain extensions (plugins, modules, and gateways) may have their own unique requirements.