In Joomla! 1.5, you'll notice:
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Substantially improved usability, manageability, and scalability far beyond the original Mambo foundations
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Expanded accessibility to support internationalisation, double-byte characters and right-to-left support for Arabic, Farsi, and Hebrew languages among others
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Extended integration of external applications through Web services and remote authentication such as the Lightweight Directory Access Protocol (LDAP)
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Enhanced content delivery, template and presentation capabilities to support accessibility standards and content delivery to any destination
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A more sustainable and flexible framework for Component and Extension developers
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Backward compatibility with previous releases of Components, Templates, Modules, and other Extensions
