Mozilla Thunderbird 0.7.1 is a fast, efficient mail and news client based on the mail/news segment of the Mozilla suite. Building on the improvements found in the 0.7 milestone (the introduction of the Themes and Extensions managers, smaller download package, noticeable performance) this update addresses flaws in the extension system alongside minor bugs. Thunderbird is a practical, free alternative to email and newsgroup clients such as Microsoft Outlook.

Cross platform, this software is available for Windows, Linux and OSX with availability for further operating systems approaching. Benefiting greatly from the stability work that went into the Mozilla 1.7 trunk, Mozilla Thunderbird is a mature, stable mail client which the average user will find immensely valuable. No longer is it limited to the realm of the software enthusiast.

The Extensions and Themes managers introduced in the 0.9 milestone allow you to effortlessly manage and add new extensions or themes to your Mozilla Thunderbird installation, or update existing packages. Extensions are small files which augment or introduce functionality to Mozilla Thunderbird. There is also support for themes, which allow you to customise Thunderbird's appearance.

Why use Thunderbird?
Smartest Way to Stop Junk Mail: Thunderbird provides the most effective tools for detecting junk mail. Our tools analyze your e-mail and identify those that are most likely to be junk. You can automatically have your junk mail deleted or you can put it in a folder you specify, just in case you like reading junk mail.
Your Mail, Your Way: View your e-mail the way you want it. Access your e-mail with Thunderbird's new three-column view. Customize your toolbar, change its look with themes, and use Mail Views to quickly sort through your e-mail.
Safe and Secure: Thunderbird provides enterprise and government grade security features such as S/MIME, digital signing, message encryption, support for certificates and security devices.
Packed with Features: Thunderbird gives you IMAP/POP support, support for HTML mail, labels, quick search, smart address book, return receipts, advanced message filtering, LDAP address completion, import tools, powerful search, and the ability to manage multiple e-mail and newsgroup accounts.
Unlimited Features: Thunderbird lets you add additional features as you need them through extensions. Extensions are a powerful tool to help you build a mail client that meets your specific needs.

Changes in this version:
Flaws in the extension system corrected
Many minor bugs addressed

If you have a previous version of Mozila Thunderbird installed on your machine, follow these steps to ensure you do not experience problems when you install the latest release. Mozilla Thunderbird is a technology preview, and should not be used for mission-critical applications.