Joomla 1.6 technical requirements
From Joomla! Documentation
Requirements for Joomla 1.6.x
Apache: v2.x recommended + http://www.apache.org
- PHP: v5.2.4 + http://www.php.net
- MySQL: v5.0.4+ http://www.mysql.com
Microsoft IIS: v7 http://www.iis.net
- PHP v5.2.4 +
- MySQL v5.1
More details will be available soon here:
http://www.joomla.org/about-joomla/technical-requirements.html