It hides Thunderbird when you minimize the main Thunderbird window or when you double click the Thunderbird-Tray tray icon. Double clicking the icon again will re-show the main window. It will be started automatically if the tray icon is double clicked when Thunderbird is not running. You can right click the Thunderbird-Tray icon to see a menu with the available options at any time. Requirements: · Thunderbird v1.0 or later [ read more about Thunderbird Tray >> ]