Download and Install Mozilla Thunderbird 3 Ubuntu 9.04 “Jaunty Jackalope”

Mozilla Thunderbird is a free, open source, cross-platform e-mail and news client developed by the Mozilla Foundation.

The new features in Thunderbird 3 help users work faster while providing the advanced flexibility and security they are accustomed to with all versions of Thunderbird.

Key new features in this release include:

* Tabbed Email: Provides the ability view individual emails and folders in tabs, and web pages via add-ons in tabs so users can quickly jump between them, just as one manages web pages in Mozilla's Firefox. Folder tabs are remembered, so Thunderbird starts up pre-configured and personalized to each user.
* Filtered Search: Designed with search in mind, the new search interface in Thunderbird 3 contains filtering and timeline tools to help users quickly and accurately pin-point the exact email by word matches, correspondents or even attachment types at the moment they need it, all based on analysis of the user's own emails.

Read more Here.

First you need to add this line to your repository, go to System->Administration->Software Sources and select the Third-Party Software tab then click the Add button and copy+paste the following line:

deb http://ppa.launchpad.net/ubuntu-mozilla-daily/ppa/ubuntu jaunty main

To add the GPG key, open a Terminal (Applications->Accessories->Terminal) and copy+paste the following line:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 247510BE

To update your sources list copy+paste the following line:

sudo apt-get update

To install Thunderbird 3 copy+paste the following line:

sudo apt-get install thunderbird-3.1 thunderbird-3.1-gnome-support

When finished close the Terminal window and you can find Mozilla Thunderbird 3 under Applications->Internet.