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Seems nice. Unfortunately I feel a bit left out since the old 2006 intel iMac (core2duo) I was given (for free) won't ever be updated past Snow Leopard (10.6).

Any reasons why more and more applications are 10.7 or 10.8 only (like Sublime eg) ? This iMac is still responsive and a joy to use (much more than my Vaio i5 laptop).

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This is how OSX has always worked. Not upgrading to the latest really isn't an option in Apple land. Because new apps tend to only support the two most recent versions of OSX. Both to take advantage of new APIs, and to not have to expend the energy to maintain compatibility with old versions of OSX.

This is the same company that has jumped across three processor families and two major OS architectures. Apple has never been very concerned with backwards compatibility.

There are powerful new APIs available to developers that are only available on newer versions of OSX.

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