The Mozilla organization today released a new version, 16.0.1, of its Thunderbird E-mail client for Linux, Mac OS X, and Windows. This corresponds to the release of Firefox 16.0.1, and addresses the same security vulnerability that was accidentally introduced in the 16.0 versions of the software. (Firefox and Thunderbird share a substantial amount of code.) The Release Notes have also been updated to reflect the change./
You can obtain the new version via the built-in update mechanism (Help / About Thunderbird / Check for Updates), or you can get a complete installation package from the Thunderbird download page.