In the long and celebrated history of Apple’s operating systems, few releases have achieved the legendary status of Mac OS X 10.6 Snow Leopard. Launched in August 2009, Snow Leopard didn't introduce a sea of new features. Instead, it did something arguably more important: it took the successful foundation of Leopard and refined it to a razor's edge. It was faster, smaller, and more stable.
3. Rosetta (Included, but Optional)
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