Status Bar Layout
Here is the basic status bar layout planned for Thunderbird 3
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Online / Offline Status
This area is reserved for the online / offline status of Thunderbird which is pulled from the operating system status.
See full article at Thunderbird:Interactive Status Bar
The Thunder Status bar is a new take on the current status bar area which delivers richer messages to user.
See full article at Today Pane Integration
The Today area provides additional integration from the Calendar for constant visible access to upcoming events.