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→Step 4: Threading/Grouping of Messages
'''The entire system should work as the folder tree in Windows Explorer: Expand&collapse threads, drag&drop messages, rename, and so on.'''
May I add my screenshot visualizing some of you your proposals as well below? http://home.arcor.de/david-peters/TB.png
[https://bugzilla.mozilla.org/show_bug.cgi?id=359270 Here] is another related discussion about Threading and Unified Who Column.
