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ROSA Marathon 2012 Release Candidate EE (Extended Edition)
ROSA Linux is Mandriva-based distro build in Russia.
ROSA 2012 Marathon is a LTS (long time support) release with guaranteed security and software updates for 5 years. Based on Mandriva/ROSA 2011 repositories with lots of improvements and updates. It is recommended for Enterprise, SMB and SOHO which do not need the "bleeding edge" technology, but require stable software and ability to work for a long time without reinstalling the system. This is the first release completely built using the ABF system (http://wiki.rosalab.ru/en/index.php/Category:ABF_Build_Environment).

You can find additional information about ROSA 2012 Marathon on RosaLab wiki:
http://wiki.rosalab.ru/en/index.php/Release_notes_ROSA_Marathon_2012