Thunderbird: Way Beyond E-Mail Aug 27, 2008, 14 :31 UTC (1 Talkback[s]) (3227 reads) (Other stories by Dirk Averesch)
"Thunderbird 2 offers options for organizing and displaying folders, including favorite folders, last visited folders or folders with unread mail, the Mozilla Foundation reports. One practical feature is the preview function: move the mouse arrow over the respective folder symbol and a pop-up with an excerpt of the latest messages is shown, without having to leave the current folder."