Thunderbird是一个支持IMAP、POP3的邮件客户端工具，它提供了一个向导程序，能让你导入 来自Outlook和Outlook Express的邮件和邮箱地址。在Thunderbird中，所有重要的功能都可以通过工具条上的按钮进行快速操作。这款邮件客户端相当易用，而且允许 你轻松地更换界面主题。快速搜索功能则允许你使用发件人或邮件主题为关键字进行搜索，并且可以按多个关键字进行分组排序显示。 
Thunderbird 24.0 发布，改进记录包括： - Message threads can now be ignored or watched.
- Email can now be sent to IDN-based email addresses.
- Zoom functionality is available in the compose window.
- In the Compose window, ctrl/cmd + and ctrl/cmd - now change the zoom setting rather than the font size.
- In Twitter, replying to a tweet now replies to all users, just like on the Twitter website.
- Interactions in the filter list dialogs have been improved.
- In Chat, user nicknames are now highlighted when mentioned.
- In IRC, long messages will now be sent in multiple parts instead of being cut off.
- Various security fixes
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