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Major Release Number ('''X'''.Y.Z) - An increment of the major number generally indicates a major rework or rewrite of the code base (framework level). Is most likely incompatible with prior major releases.

Currently Joomla! has released the following major releases:

* 1.0.x - code base derived from Mambo 4.5.3
* 1.5.x - major rewrite of the codebase, parts of Joomla! 1.0.x still reside in the codebase
<noinclude>[[Category:Development Working Group]][[Category:Bug Squad]]</noinclude>