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I use(ed) "DesktopOK" to minimize Thunderbird.
Info: http://www.softwareok.de/?page=Windows/Info/DesktopOK/3
Download: http://www.softwareok.com/?seite=Freeware/DesktopOK
Because this addon hasn't worked at the beginning (but it now does)
https://addons.thunderbird.net/en-US/thunderbird/addon/minimizetotray-reanimated/