Minimize to tray on startup works if... Rated 5 out of 5 stars

Minimize to tray on startup works if you set up preferences to minimize on clicking close or minimize button. Windows shortcut properties must be set up to startup Thunderbird in minimized window, and Thunderbird window cannot be maximized while exiting the app. You can donate now! ;-P ;) Great addon! :)

This review is for a previous version of the add-on (1.0).