In early 2009, the Archdiocese of Saint Louis determined that it needed to upgrade its website, mostly for security concerns. After investigating a move from Joomla! 1.0.x to Joomla! 1.5.x, the Archdiocese determined it would be more cost effective and a more future-proof decision to migrate the over 49 individual Joomla! sites that comprised www.archstl.org into a single Drupal installation

Follow this link:
Archdiocese of Saint Louis Migrates to Drupal

