Original Release Date: November 2, 2025
Year of Release: 2007
Release Version Number: 10.5
Architecture Supported: PowerPC, Intel
Mac OS X 10.5 Leopard was released in October 2007, featuring over 300 new enhancements.
Key features included Time Machine backup system, redesigned Finder with Cover Flow, Spaces for virtual desktops, Boot Camp for native Windows installation, Quick Look for instant file preview, and enhanced Spotlight. Also added Stacks in Dock, improved Mail with Notes and To-Do’s.
Major architectural changes: Full 64-bit application support across the entire system on capable hardware. Updated Unix foundation with modernized networking stack. Introduced Core Animation framework for advanced graphics rendering and visual effects throughout the interface.