Joomla, one of the world’s most popular open source content management systems (CMS) used for everything from websites to blogs to Intranets, today announces the immediate availability of Joomla 2.5. Along with new features such as advanced search and automatic notification of Joomla core and extension updates, the Joomla CMS for the first time includes multi-database support with the addition of Microsoft SQL Server. Previous versions of Joomla were compatible exclusively with MySQL databases.
UPD Apparently I was a little rushed. PostgreSQL and Oracle support must be added in the shortest time. Waiting for explanations from Joomla!