Packages:
I have put together a few packages with the files you require to set up Mozilla Thunderbird with Enigmail and GnuPG. I've also included Contacts Sidebar - in my opinion, this an essential add-on to Thunderbird, but it is optional.  Mozilla Licensing terms prevent the distribution of Thunderbird with extensions pre-installed, so you will have to install them yourself, but they are included. All files are signed using my Public Key.  These packages provide you with all you need to start using OpenPGP email encryption. All files are covered by the Gnu Public License and may be subject to some cryptographic-related laws.  Please see the GnuPG website for more details.

Last Update 27 Dec 2007: All packages updated to include Enigmail 0.95.52 and Thunderbird 2.0.0.9. GnuPG 1.4.8 also included in all packages. Please be aware that newer versions of the software used in these download packages may be available - it is recommended that you check for updates using HELP > CHECK FOR UPDATES after installation.  Many problems with the Webmail extensions can be corrected by checking for compatibility updates via Thunderbird's Add-Ons section.

Windows Download - encrypted-mail-win.zip and signature
Linux Download - encrypted-mail-linux.tar.bz2 and signature
Mac Download - encrypted-mail-mac.zip and signature

Please note, I've created a new Flash demo on how to set up encrypted mail on Windows. Click here.

You can also now download Mobility Email - this is a portable email solution for Windows computers (or Linux running WINE) that incorporates all the functionality of the installed packages above, but will run from a standalone location (eg. a USB Flash Disk or iPod) without installation or much configuration. Check it out.

Cryptography-related downloads:

Mobility Email - A pre-configured email client with built-in OpenPGP and S/MIME support.

Mobility Email Components - Download updated components for Mobility Email individually.

Mozilla Thunderbird - An excellent, free email client with versions for most platforms available.

Enigmail - An excellent encryption plugin for Thunderbird. Available for several platforms.

GnuPG - The encryption engine behind OpenPGP.

GPGee - Adds a Windows Explorer right-click extension so you can encrypt, sign and verify files.

PGP Free Edition - A 30 day trial of the full version, which reverts to PGP Free after 30 days.

TrueCrypt - Creates an encrypted "drive" on your computer, allowing you to save files and open files as though it was a removable disk.  Enter your password to open it, dismount it to close.

Eraser - Securely deletes data from your hard disk by overwriting it several times so it can't be recovered.

Other Useful Software:
Here are a few links for non-encryption related software that I have used and can recommend.

Mozilla Firefox - The best web-browser around.  Open source and completely free.

AVG AntiVirus - A free, fully-featured AntiVirus package.

Comodo Personal Firewall - A free, well-featured firewall. Essential if you use the internet.

Ad-Aware / SpyBot - Two excellent free anti-spyware packages.  Get rid of malware now!

CDex - An excellent free program for high-quality mp3 ripping. Supports many other formats.

Real Alternative - Play Real Player streaming media without having to install Real Player.

TugZip - An excellent free archive utility.  Supports most compression formats.

NVU - Mozilla's free, open source web authoring tool. Simple interface, great for HTML editing