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Hello,
I have downloaded the version 3.8.1, get the error message that program is corrupted.
Use Thunderbird 64.0.2 (64bit)
Greeting André

Questa recensione riguarda una versione precedente (1.2) del componente aggiuntivo. 

Where in the lords name did you get version 3.8.1? Official version here at ATN is 1.2 and it is compatible with TB 60.