How to Upgrade Joomla 2.5 to Joomla 3
Resources – Upgrade from Joomla 2.5 to Joomla 3 Joomla 2.5 to 3.x Step by Step Migration (Joomla) How to Upgrade from Joomla 2.5 to Joomla 3 (Jan 6, 2013) Upgrade from Joomla 2.5 to Joomla 3 Practical Guide Upgrade Joomla 2.5 to Joomla 3.x (Mar 3, 2013)