The good folks at the Mozilla Messaging project have released a new version, 3.0.4, of the Thunderbird E-mail client. This versions corrects a number of bugs, including five security vulnerabilities, three of which are serious. Further details are in the Release Notes. The new version is available via the built-in update mechanism (Help / Check for Updates from the main menu); alternatively, versions for all platforms (Linux, Mac OS X, and WIndows) can be downloaded here, in your choice of 50 or so languages.