New in Thunderbird 3.0.4:

* Several fixes to improve stability and security, see the Security Advisory.
* Several fixes to the user interface.

Complete release notes :
http://www.mozillamessaging.com/en-US/thunderbird/3.0.4/releasenotes/

New in Thunderbird 3.0.3:

* Fix for missing folders or empty folder pane after updating to Thunderbird 3.0.2

Complete release notes : http://www.mozillamessaging.com/en-US/thunderbird/3.0.3/releasenotes/

New in Thunderbird 3.0.1:

- Several fixes to improve stability and security
- Several fixes to the user interface and attachment handling.

Please see the complete list of changes in this version.

New features in Thunderbird 3 include:
http://www.mozillamessaging.com/en-US/thunderbird/3.0.1/releasenotes/

Fixed in Thunderbird 2.0.0.19
MFSA 2008-68 XSS and JavaScript privilege escalation
MFSA 2008-67 Escaped null characters ignored by CSS parser
MFSA 2008-66 Errors parsing URLs with leading whitespace and control characters
MFSA 2008-65 Cross-domain data theft via script redirect error message
MFSA 2008-64 XMLHttpRequest 302 response disclosure
MFSA 2008-61 Information stealing via loadBindingDocument
MFSA 2008-60 Crashes with evidence of memory corruption (rv:1.9.0.5/1.8.1.19)