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Downloading Thunderbird

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I've tried several times to install Thunderbird but at the last stage, a message says my password is incorrect. There's no way of accessing my password to check it or choosing a new password. I don't know what to do!

I've tried several times to install Thunderbird but at the last stage, a message says my password is incorrect. There's no way of accessing my password to check it or choosing a new password. I don't know what to do!

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