Thunderbird-Tray is a system tray launcher tool for Mozilla Thunderbird, the popular e-mail client. You can use TB-Tray to hide Thunderbird to the tray while you don't need it. When you click the tray icon, TB-Tray will restore Thunderbird.
It saves the task bar space and notifies the user when new mail(s) arrived. It would be great if the sign of new email removed immediately after the mail has been read. Sometimes it still shows the new mail sign after reading all the new mails. Hiding new mail sign on hover of the TB-Tray also will be good if the mails are read already.
I am pleased with this software. I always recommended!