> Mail.app and Evolution at least. > And doesn't Outlook also support them nowadays?
Ah, you mean "saved search" containers in the tree view? Thunderbird has these too. Doesn't quite make it Gmail though. I mean, it's a cute feature, but it does not modify the work flow drastically enough to be even remotely useful as anything else than a curiosity. Gmail modifies, or rather, fixes the entire work flow ;-).
