I recently installed Joomla to see what it has to offer in a business setting. The software is a free content management system available at http://www.joomla.org/. There is an active forum with loads of help from other users. Joomla is generally installed on a Linux environment but I only have a windows system available at the moment so I installed xampp and all is working well.
My initial plan was to migrate an existing intranet in stages to Joomla. Joomla provides a wrapper module which is basically an iframe which is great. This means that a Joomla page can just be pointed to the original intranet page. Straight away though there was a problem. The wrapper auto height would not work correctly and I ended up with additional scrollbars which did not look pretty.
Plan ‘B’ is you use wrappers where possible and redevelop other pages in PHP and create new Joomla modules.