If any of these items are not supported, your system does not meet the minimum requirements for installation. Please take appropriate actions to correct the errors. Failure to do so could lead to your Joomla! installation not functioning properly.  

Requirements for Joomla 1.7.x and 1.6.x

Software Recommended Minimum More information
PHP 5.3 + 5.2.4 + http://www.php.net
MySQL 5.0.4 + 5.0.4 + http://www.mysql.com
(with mod_mysql, mod_xml,
and mod_zlib)
2.x + 2.x + http://www.apache.org
Microsoft IIS 7 7 http://www.iis.net

 Joomla 1.6 will require PHP 5.2+ and MySQL 5.0.4+.


Requirements for Joomla 1.5.x

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
(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.

**** For Microsoft IIS (depending on your setup) you may need the following:

Configuration options

If installing on a local computer, there are a number of packages that will help you get set up quicker than individual installations: