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Thunderbird メッセージの高速全文検索、タブ表示、アーカイブ。設定も簡単で、カスタマイズ自由自在。そんなメールソフトが Thunderbird です。 The Future of Thunderbird Experience cutting edge features. Provide feedback to help refine and polish what will be in the final release. Thunderbird Daily 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!