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I'm currently on 10.6 and I really like it so I'm not really thinking about an upgrade right now. Two things I really like about 10.7 are the full screen apps and the Mail client.

Is it possible to somehow upgrade/purchase the Mail client of 10.7 alone? It would be really nice if I could do that.

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up vote 5 down vote accepted

These apps (and the full screen mode) require APIs that are not available on versions prior to Lion. Even if one could purchase Mail separately, it wouldn't run.

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It's not possible, unfortunately, and copying and pasting it won't work either. (FaceTime cannot be copied from 10.7 to 10.6 also.)

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Consider Postoffice mail app; it's got a lot to offer if you can't upgrade to lion.

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Please add an url and information what is thedifference between for example to make the answer more complete. – Rob Jul 3 '14 at 6:24

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