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I've installed 2.0.1 on Windows 7 and Thunderbird 3.0.4. When sending mail, an error like "Temporary file cannot be opened, check Temporary directory preference". The second time Send button is pressed, there's no error.

Esta análise é para uma versão anterior do extra (2.0.1). 

I'm not sure what's causing that, or how to fix it, but I do know about it. Try the beta channel version and let me know if there's any improvement.