| Software | Recommended | Minimum | More information |
| PHP* | 5.2 + | 4.3.10 | http://www.php.net |
| MySQL** | 4.1.x + | 3.23 | http://www.mysql.com |
| Apache*** (with mod_mysql, mod_xml, and mod_zlib) |
2.x + | 1.3 | http://www.apache.org |
| Microsoft IIS**** | 7 | 6 | http://www.iis.net |
*Do not use PHP 4.3.9, 4.4.2 or 5.0.4. These releases have known bugs that will interfere with installation. Zend Optimizer 2.5.10 for PHP 4.4.x also has serious bugs and you should ask your host to upgrade to a newer version. Joomla! versions 1.5.15 + are compatible with PHP 5.3. Note that the OpenID library is not yet compatible with PHP 5.3.
**Joomla is not yet compatible with MySQL 6.x.
***In order to use SEO URLs, you will need to have the Apache mod_rewrite extension installed.
****Joomla is optimized for Apache, but also runs on Microsoft IIS (though not officially supported). Depending on your setup, you may need the following
Joomla 1.6 will require PHP 5.2+ and MySQL 5.0.4+.
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