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OS compatibility: Mac OS X 10.6 or later - Macworld (blog)
http://news.google.com/news/url?sa=t&fd=R&usg=AFQjCNFFkItFdoyb056Rw6EIB1G330fcxw&url=http://www.macworld.com/article/162947/2011/10/sidekick_4_0_3_gem.html