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I just looked at the sales figures Apple reported. Apple has so far sold 95 million Macs that run the Mac App Store (Apple sells between 4 and 5 million Macs pe

I just looked at the sales figures Apple reported. Apple has so far sold 95 million Macs that run the Mac App Store (Apple sells between 4 and 5 million Macs per quarter). The Mac App Store came preinstalled with Lion and was added to Snow Leopard in version 10.6.6. If you are planning to offer your app on the Mac App Store, you don’t need to worry about compatibility with Leopard and Tiger, as those customers won’t see your app anyways. To me, that seems like a much better situation for developers than it is on the Windows side, where 40% of users still run XP.

cygwin98 13y ago
Even for the same method each version of Mac OS X can behave slightly different, which causes pains for the users due to crashes and the developers to scratch their heads to reproduce. I've read quite a number of blog posts that the developers tried to reproduce a bug only happens to Snow Leopard. Extra code had to be written only for that. You can imagine how the code will smell if extra efforts need to be made for each version. That's the fragmentation issue I talked about and had concerns with.