Thunderbird 3.1.8 update is now available

An update for Thunderbird 3.1.8 is now available for Windows, Mac, and 
Linux for free download from http://www.GetThunderbird.com/. This 
release makes several improvements to Thunderbird's performance, 
stability, and security.

Thunderbird 3.0.11 was the last security and stability update for 
Thunderbird 3.0.x. Thunderbird 3.0.x users will be prompted and 
encouraged to start using Thunderbird 3.1.

We strongly recommend that all Thunderbird users upgrade to this 
release. If you already have Thunderbird 3.1, you will receive an 
automated update notification within 24 to 48 hours. You can also 
manually fetch this update by selecting "Check for Updates..." from the 
Help menu.

For a list of changes and more information, please review the 
Thunderbird 3.1.8 release notes: 
http://www.mozillamessaging.com/en-US/thunderbird/3.1.8/releasenotes/