Converting a Joomla site to Wordpress

I have a potential client who wants to take an existing Joom开发者_如何学运维la site and translate it into Wordpress. Is any sort of automagical conversion possible, or will I have to reconstruct the site in word press?

Thanks

The Wordpress Codex gives some plugins that could help you importing from Joomla to Wordpress: http://codex.wordpress.org/Importing_Content#Joomla

Best practive however, depends on what you want to import: Users, articles, whole design, etc...