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Nostalagy++ 1.0.15 (last version available from https://addons.thunderbird.net/) doesn't work on TB 68.9.0 64-bit. Last version from Github is 1.0.25 and doesn't work as well (and author it is flagged as Alain Frisch).
On top of that description does not detail what is different from original Nostalgy extension by Alain Frisch.
Also, what are "emais"?

Questa recensione riguarda una versione precedente (1.0.15) del componente aggiuntivo. 

Nostalgy versus Nostalgy++:
This is a port of Nostalgy by Alain Frisch to TB 68. Nostalgy has published my update (I updated it for them), but the original source of the update is not mentioned there.

My update to TB 78 is finished 50% and will follow soon.