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Snow Leopard had a lot of backend work on it, completely removing PPC code, I'd call that a significant upgrade.
 
Snow Leopard had a lot of backend work on it, completely removing PPC code, I'd call that a significant upgrade.

That might be a big backend change but IMO it only caused grudge among the actual users. If we think about big changes that affect most users, then I would say Leopard and Tiger were pretty big updates. SL and Lion haven't really brought anything new.
 
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