When new unread mail arrives in a folder, Thunderbird turns the folder-name and unread-mails count to Blue. However, this indication does not survive a restart, so if a folder currently has new unread mail and TB is restarted (or for instance a Windows restart occurs) then the folder remains unmarked. Could the "new unread mail" status be preserved so that the indication is shown when TB restarts? I'd suggest that no "new unread mail" should remain unmarked, "new unread mail from previous sessions" be marked in one colour and "new unread mail in this session" be marked in another. My preferences would be black, turquoise and hot pink for these three states. Others would inevitably disagree, so a simple colour-select facility (possibly via config) would be desirable
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