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https://magazine.joomla.org/all-issues/issue-august-2013/when-should-you-upgrade-your-joomla-1-5-site
When Should You Upgrade Your Joomla 1.5 Site - The Joomla Community Magazine
According to W3Techs, as of the beginning of July 2013, 63% of all Joomla sites are running version 1.x. Of these, some 92% are running version 1.5. That works...