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Is It?
Is It?
If you mean application compatibility, most 10.5 stuff will run on 10.6 but not all.
Not all hardware running 10.5.8 can run 10.6. 10.5.8, or "Leopard," was the last build for the Motorola line of processors, commonly referred to as G4 or G5. OS X 10.6, or "Snow Leopard," was the first Intel-only OS and cannot be run on the Motorola processors. In that way, 10.5.8 and 10.6 are not compatible, but it's dependent on the hardware architecture.