I probably would have started a bit earlier, though admittedly the features I remember and care(d) about are only of interest to retrocomputing enthusiasts anym

I probably would have started a bit earlier, though admittedly the features I remember and care(d) about are only of interest to retrocomputing enthusiasts anymore. - 10.5 Leopard: Classic mode removed (can no longer run Mac OS 9 apps), won't run on G3 processors or install on systems under 867MHz (though not difficult to circumvent). - 10.6 Snow Leopard: AppleTalk removed. Can no longer create HFS volumes. Removed support for all PowerPC processors.