The English language version is the only one that’s available for Windows, Mac OS X and Linux. it’s a stability release over version 1.05 – which contains security fixes, including the ones for Secunia Security Advisory SA16062. “To avoid crashes or other problems, do not install a new version using the installer into the same folder as an older zipped installation.
Here’s what’s new in Thunderbird 1.0.6:
* Restore API compatibility for extensions that did not work in Thunderbird 1.0.5, including Enigmail.
Here’s what’s new in Thunderbird 1.0.5:
* Several security fixes.
* Improvements to stability.”
[Windows | OS X | Linux | FREE]