Mozilla.org has released Thunderbird 0.3 Release Candidate 2. This update to the standalone, Mozilla-based mail client offers several fixes. From the developeris release notes posted in the MozillaZine Forums:
1) the padding in the toolbars was too small (especially when using small icons)
2) the spell checker was not spell checking your text when you replied to a message (I had to back out the change to not spell check the reply text i.e. iJohn Doe wrote:i in order to fix this).
3) News should use the serveris username and password for authenticating (Bug #36816).
4) the build ID now says 9/24
The application is avilable for Mac OS X, Linux, and Windows. Downloads can be found at the Mozilla Thunderbird homepage.