Mozilla.org, creators of the Firefox web browser, has just released version 3.1.3 of Thunderbird, its free e-mail client. The new program, an 19.2 megabyte download, sports the following fixes and new features:

- Several fixes to improve stability and security, see the Security Advisory.

- Several fixes to improve stability.

- Several fixes to the user interface.

Thunderbird 3.1.3 requires Mac OS X 10.4 or later to install and run.

If you’ve played with the new version and have any feedback, positive or negative, let us know.