Thunderbird 10
Thunderbird is a fast, flexible e-mail client. You can quickly search through your e-mails, worry less about spam thanks to the spam filters, and even customize how you view Thunderbird. Thunderbird works with most Firefox add-ons as well, adding more content to your e-mail client. Thunderbird makes the e-mail experience fun again.
Download: Thunderbird 10
Changes: Release Notes
Homepage: Mozilla Thunderbird