Thunderbird is a great email client from the same people who brought you the Firefox browser.
Thunderbird gives you IMAP/POP support, a built-in RSS reader, support for HTML mail, powerful quick search, saved search folders, advanced message filtering, message grouping, labels, return receipts, smart address book LDAP address completion, import tools, and the ability to manage multiple e-mail and newsgroup accounts.
In addition to the feature set found in Mozilla Mail, Thunderbird has several new features and improvements to make your mail and new experience better.
Thunderbird 2 Features
Message Tagging
Thunderbird 2 allows you to “tag” messages with descriptors such as “To Do” or “Done” or even create your own tags that are specific to your needs.
Improved Search
Thunderbird 2 features a new find bar that speeds up searches within displayed messages. Thunderbird also offers quick search, which starts showing search results as soon as you start typing in search terms.
Saved Searches
Do you find yourself searching for the same subject or message content over and over? Thunderbird 2 saves you time by allowing you to store this search as a folder. Rerunning the search is just a matter of clicking on the saved search folder in the folder pane.
Advanced Folder Views
Thunderbird 2 offers a variety of ways for you to organize and display your folders, whether by favorites, recently viewed or folders containing unread messages.
Stay Informed
Thunderbird 2 has been updated to provide more informative and relevant message alerts containing sender, subject and message text for newly arrived messages.
Easy Access to Popular Web Mail Services
Thunderbird 2 makes it even easier to integrate and use various Web mail accounts from one inbox. Gmail and .Mac users can access their accounts in Thunderbird by simply providing their user names and passwords.
What's New
Tabs and Search
If you like Firefox’s tabbed browsing, you’re going to love tabbed email. Thunderbird 3’s tabbed email lets you load emails in separate tabs so you can quickly jump between them.
Message Archive
If you think you’re going to need an email in the future but want it out of your inbox without deleting it, archive it! Archiving helps you manage your inbox and put your email into a new archive folder system.
