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Is there any possible way to use the Lion Mail.app in Snow Leopard? I was thinking to somehow extract it from the Lion disk image, and then just put it in /Applications on Snow Leopard. But I'm guessing there are compatibility issues that would keep this from working. Anyone have a solid answer on this?

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did you try this? –  Yar May 3 '12 at 14:54
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The Lion Mail.app will make references to interface frameworks / interface elements that are not available in Snow Leopard and will either not run at all or be incredibly unstable.

With that said, I would be interested to see what happens. You could always back up the Mail.app in Snow Leopard and give the Lion version a go... it won't be the end of the world.

Based on my searches, there is no solid evidence - but you could be a source if you give it a shot.

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