I don't know, it's still not as good what some threaded email clients or newsgroups were doing 10 years ago. Yes, gmail groups together connected messages, but that's all it does. Email is like a tree, with branches; gmail flattens all those the branches together into one disorganised bundle, at best ordered by date.
Labels instead of folders on the other hand, I like.
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Labels instead of folders on the other hand, I like.