Thunderbird 1.5.0.5
Thunderbird delivers. Enjoy safe, fast, and easy email, with intelligent spam filters, quick message search, and customizable views. Brought to you by the makers of Firefox, Thunderbird makes email better.
The Perfect Companion to Firefox
Thunderbird 1.5.0.5 is the perfect email companion to the Firefox Web browser. Easily import your existing email accounts and messages. Quickly find the message you're looking for with search tools and filters. Block spam before it ever reaches your inbox.
Fully Featured Email
Simple to use, powerful, and customizable, Thunderbird is a fully featured email application. Thunderbird supports IMAP and POP mail protocols, as well as HTML mail formatting. Built-in RSS capabilities, powerful quick search, and advanced message filtering round out Thunderbird's modern feature set.
Junk Mail Filters
Each email you receive passes through Thunderbird's leading-edge junk mail filters. Each time you mark messages as spam, Thunderbird improves its filtering so you can spend more time reading the mail that matters. Thunderbird will also use your mail provider's spam filters to keep junk mail out of your inbox.
Anti-Phishing Protection
Thunderbird protects you from increasingly common email scams - also known as 'phishing' - which try to fool you into handing over your passwords and other personal information. Thunderbird will tell you when it thinks a message might be a scam and help you automatically filter out these fraudulent requests.
Advanced Security
Thunderbird protects your inbox with advanced security features, including digital certificates and message encryption. Attachments are never run without your express permission, protecting you from many worms and viruses.
Automatic Updates
The new Software Update feature makes it easy to get the latest security and feature updates to Thunderbird. Thunderbird automatically downloads these small updates in the background and prompts you when they are ready to be installed.
Customize Thunderbird
Select new button controls for your toolbars, install extensions to add new features, or change the look of your email application with themes - the way Thunderbird looks and works is under your control.
Support and Discussions
Thunderbird mail forums: Please file all bugs in the bugs forum here instead of posting in bugzilla.
Thunderbird Help: Comprehensive help site with a user FAQ
Introduction to Thunderbird: Get started with using Mozilla Thunderbird.
For Developers
The development pages (on the Mozilla.org Website) cover source code, developer resources, roadmap, etc.