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The only missing item I see is the Grouped By Sort bars. View -> Sort By -> Grouped By Sort.

Questa recensione riguarda una versione precedente (1.6) del componente aggiuntivo. 

Thank you for a report.

Because the appearance of original LeopardMail was lost when I included the function by all means, I took off a function.
Please expect it in new Thunderbird 3.
Thank you.