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Thunderbird Thunderbird 是一款免费的电子邮件应用程序,配置简单,定制自由——还附有强大功能! The Future of Thunderbird Experience cutting edge features. Provide feedback to help refine and polish what will be in the final release. Thunderbird 每日版 Help us test the newest developments made to Thunderbird every day by using the unstable Daily channel. WARNING! Daily is an unstable testing and development platform, make sure you back up important data regularly!