“Apple Inc. this week began testing Mac OS X 10.5.3 Update, a third maintenance and security update to its relatively new Leopard operating system that already bundles over 75 bug fixes and code corrections,” AppleInsider reports.

“The Mac maker on Thursday informed its vast developer community of the availability of Mac OS X 10.5.3 Build 9D10, a pre-release copy of the software update featuring a core focus list spanning some two dozen core components,” AppleInsider reports.

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