Mozilla has officially released Thunderbird 24.1.1, an email and RSS client, for all the available platforms, including Linux.
A new version has been released for the Thunderbird 24.x branch but, as you would expect, this is no more than a simple maintenance version incorporating a number of security fixes.
The changes in this latest build of Thunderbird include a use-after-free fix in the HTML document templates, a fix for a memory corruption in workers, and corrections for various use-after-free issues found through ASAN fuzzing.
Just like any other version (even Beta), you can run the new Thunderbird in parallel with the old one, if you don't want to upgrade, which would be rather difficult because it hasn't been uploaded in any of the major repositories, with the exception of Arch Linux.
Just download the archive, extract it, and run the executable file. Also, keep an eye on the release notes, maybe Mozilla will grace us with some details after all.
This update is recommended because the 24.x branch of Thunderbird also introduced a fix for an issue where signatures were shown in too light gray, making them difficult to read, and a fix for an issue where the Auto CC for reply might not have worked if the CC address was the same as the sending address has been implemented.
It's interesting to note that Firefox and Thunderbird have been separated once again. Firefox 25 has been released, but Thunderbird didn't make the same jump.
Don't forget to check out our review of the RSS function of Thunderbird.