Rated 5 out of 5 stars
Until TB 5.0 updates use this tip...Install (Minimize On Start and Close 1.3.2) and (TrayIt! 188.8.131.52) together with TB 5.0 .
This is an alternative way to have TB 5.0 startup and have an icon placed into your sytem tray When your Windows system starts up.
Read instructions that come with (TrayIt! 184.108.40.206) to see how to start TB on system start up,,,
Or just see here: http://techstroke.com/how-to-launch-thunderbird-automatically-at-startup-minimized-in-system-tray.html
When you enable (TrayIt! 220.127.116.11), and add TB 5.0 to it, an icon will be placed into the system tray instead of the start bar when your system starts up.
Make sure you install (Minimize On Start and Close 1.3.2) To TB 5.0 and check the boxes under options that says minimize on start and close
Link for (TrayIt! 18.104.22.168) http://www.teamcti.com/trayit/trayit.htm
Link for (Minimize On Start and Close 1.3.2) https://addons.mozilla.org/en-us/thunderbird/addon/minimize-on-start-and-close/