Thunderbird-Tray
Thunderbird-Tray is a system tray launcher tool for Mozilla Thunderbird, the popular e-mail client. You can use TB-Tray to hide Thunderbird to the tray while you don't need it. When you click the tray icon, TB-Tray will restore Thunderbird. It also has a menu of options for quick access to... Thunderbird-Tray is freeware (open source) and licensed under the GPL.
http://umn.dl.sourceforge.net/sourceforge/tbtray/TBTray-1.2-setup.exe - 284Kb - Download - Screenshot

EZ ThunderBird Backup Basic
EZ ThunderBird Backup Basic makes it easy to backup your mail and address book to a ZIP archive and works with the Windows Task Scheduler to provide an automated backup solution.
http://www.rinjanisoft.com/ezthunderbirdbackup/rezt3_0.exe - 974Kb - Download - Screenshot

EZ ThunderBird Backup Pro
EZ ThunderBird Backup Pro makes it easy to backup your mail and address book to a ZIP archive or to CD/DVD and works with the Windows Task Scheduler to provide a completely automated backup solution. The wizard interface makes the program incredibly easy to use and a restore utility is included.
http://www.rinjanisoft.com/ezthunderbirdbackuppro/reztp3_0.exe - 974Kb - Download - Screenshot

Mozilla Password Recovery
Mozilla, Firefox and Thunderbird have comfortable password managers, but if you compare them to the Protected Storage of IE or WAND of Opera, the latter ones are more powerful and functional. Mozilla Password Recovery is a small utility that reveals the Autofill passwords for Firefox and... With this utility, you can also recover passwords protected with the User Master Password. ... The program traditionally offers you two recovery modes: automatic and manual.
http://www.passcape.com/download/mpr.zip - 612Kb - Download - Screenshot

Automatic Print Email
'Automatic Print Email' is the ideal program for all those which do not have time or the reflex to look at their emailbox. This software checks at regular interval your emailbox and automatically prints the new emails without downloading them in your mail software (Like Outlook, Pegasus,... Use your email box like a fax! ... You can define rules which changes the printer according to the type of email or even automatically remove your emails which contain keywords. ... ).
http://www.automatic-print-email.com/download/autoprintemail.exe - 3Mb - Download - Screenshot

Tiger Privacy
With Tiger Envelopes you can stop snoops from reading your email, for free. Forever. Ordinary email is like sending all your messages on postcards. Anyone who's nosy can read it. What we need is something as easy as envelopes, but for email. That's what Tiger Envelopes is. ... Automatically configures Mac Mail, Thunderbird, Outlook, Outlook Express, and KMail for you. ... There are no extra steps. ... Tiger even puts your message in the envelope for you. ... One click to install on Mac, Windows, and Linux.
http://prdownloads.sourceforge.net...envelopes-mac-installer-0.7.3.sit - 16Mb - Download - Screenshot

AY Mail
Powerful mailing software. Easy import from Outlook, Netscape, Mozilla, Thunderbird, Eudora, ODBC, SQL, Exel, Access etc, ability to send directly from external data sources, automatic removal of duplicate addresses, fast multithreaded email address verification, text or HTML messages, built-in... Three different editions to fit your needs and budget.
http://www.aysoft.com/bin/aymail26.exe - 1Mb - Download - Screenshot

ThunderStor
ThunderStor offers the user a simple, fast and effective method to extract ThunderBird Mail (or any mbox compatible mail client) from the mail box files to individual standard message files. A command line and windows interface offers a the user a clean and powerful method to extract, archive... Output includes: From Log, To Log, Mssage List and HTML Log, Attachments List and HTML Log, EMail address list, transactions log, message attachments and RFC822 compatible message files. ... You can even automatically extract Atachments and reference a plain text list and an html page with links...
http://bitdaddys.com/downloads/ThunderStor-Setup.exe - 4Mb - Download - Screenshot

Vanquish Personal Anti Spam (vqME.com)
Stop spam. The only anti-spam you can buy with today? s most advanced technology and the power of Personal Value Control. Prevent junk mail, viruses and spyware. Get the email you want and the respect you deserve. Block spam, protect your identity and enjoy email again. ... Seamlessly works with any standard POP3 email program such as Outlook, Outlook Express, Eudora, Lotus Notes, Opera M2 and Mozilla Thunderbird. ... Stops email spam, viruses and identity theft attempts. ... Try free for 15 days and see what spam-free peace of mind is all about.
http://www.vanquish.com/downloads/vqme.exe - 2Mb - Download - Screenshot

Back4Win
Back4Win includes Mozilla Firefox and Thunderbird backup. It's safe and easy to use. Powerful arrangement of backup size - spanning disks, predefined disk size to suit CDR CDRW media etc. Can restore from a disk which has lost the directory reference (most ZIP programs cannot do this). ... Backups are labeled with a unique easy-to-find timestamp. ... Various modes of backup operation provide easier and faster ways of doing your backups, and much more. ... Extensive Device Support - CDRW, DVDRW, Internal/External/Networked Hard Drives, MO, Zip & Jazz, USB pen drives, Floppy etc.
http://www.back4win.com/b4win.exe - 2Mb - Download - Screenshot