So as I understand it, Snow Leopard is completely 64-bit meaning 32-bit apps will not run. How will Time warp/time capsule restore apps from 10.5 when you upgrade to a 10.6 machine?
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On Mac OS X Leopard and in Snow Leopard, Apple designed the kernel to run both 32 and 64-bit software natively with no compatibility layer running, and all supporting files and libraries can be organized in the same application bundle. That means developers can distribute a single installer that works on any Mac, and that users won't need to make sure they've obtained the correct binary for their machine. This promises to go a long way in making the transition to 64-bit Mac software very smooth and virtually invisible to most users.
Snow Leopard is completely 64-bit meaning 32-bit apps will not run.
Funny thing, I got it from an Apple Insider editorial called, "Windows 7 vs. Mac OS X Snow Leopard: Apple ups the ante". They say 64-bit will be the default instead of an option.
If I was using a MacBook with 32-bit binaries and then I upgrade to the latest MacBook with Snow Leopard, Time machine won't have the 64-bit binaries. Hmmm maybe Apple's Update program will replace the 32-bit binaries with 64-bit ones.