Just Released

• Thunderbird 5 Beta (Miramar) – May 25h
• Thunderbird 6 Earlybird (6.0a2) – June 16th

Coming Soon

• Thunderbird 3.1.11 – June 21st

Future Releases

• Thunderbird 5 Final Release – July 5th
• Thunderbird 6 Beta – July 5th*
• Thunderbird 6 Final Release – August 16th
• Thunderbird 7 Earlybird – August 16th*

* As part of the new Rapid Release Schedule, dates listed for Aurora and Beta builds reflect when the code merge is to begin. The actual release to that particular channel may vary by several days. See this post for more details.