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Mac OS X 10.4 Tiger was succeeded by Mac OS X 10.5 Leopard on October 26, 2007, after 30 months, making Mac OS X 10.4 Tiger the longest running version of Mac OS X. The last security update released for Mac OS X 10.4 Tiger users was the 2009-005 update. The next security update, 2009-006 only included support for Mac OS X 10.5 Leopard and Mac OS X 10.6 Snow Leopard. The latest supported version of QuickTime is 7.6.4. The latest version of iTunes that can run on Mac OS X 10.4 Tiger is 9.2.1, because 10.0 only supports Mac OS X 10.5 Leopard and later. Safari 4.1.3 is the final version for Mac OS X 10.4 Tiger as of November 18, 2010. Despite not having received security updates since then, Mac OS X 10.4 Tiger remains popular with Power Mac users and retrocomputing enthusiasts due to its wide software and hardware compatibility, as it is the last Mac OS X version to support the Classic Environment, a Mac OS 9 compatibility layer, and PowerPC G3 processors.