Easier to Get Started Tabs and Search Customize Your Email Experience Secure and Protect Your Email 協力する Thunderbird is an open source project, which means anyone can contribute ideas, designs, code, and time helping fellow users. Join Us Make a Donation • Get Support • バグを報告 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。