Mozilla Thunderbird makes e-mailing safer, faster, and easier with such features as intelligent spam filters, a built-in RSS reader, and quick search. Thunderbird was designed to prevent viruses and to stop junk mail. Thunderbird 3 includes tabbed e-mail, new search tools and indexing, smart folders, support for Firefox's Personas, a simplified setup wizard, and robust junk protections that include phishing and spam filters.
What's new in this version:
Copy/Paste into plain text editor deletes newlines from quoted text (bug 1143570)
Cross-posts won't send because Newsgroups: groups are separated with comma+space, not just comma (bug 1151448)
Cannot send email through exchange server (NTLM) (bug 1174159)
Doesn't display GB2312 encoded texts correctly for Chinese Characters (bug 1174580)
OAuth2 authentication for GMail does not work when specified server is imap.gmail.com or smtp.gmail.com. (bug 1176773)