Bug 533775 changed the Unread and Favorite folder view from a flat list of folders to a tree having account nodes, similarly to the All view. There was suggestion to also try this for the Recent folder view. This view is a bit specific, e.g. the folders there are sorted alphabetically, not by account (and this behaviour would be changed). So this needs more UI thought on how it should behave.
I'm totally in favor of this. I never learned to use any of the special folder views exactly because it's way to hard to find the folder you need. You just want things grouped logically together and in the order you're used to. Neither of those criteria is filled as is.
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