Another more comprehensive FAQ for Thunderbird is available at: http://texturizer.net/thunderbird/faq.html
Q: I cannot import my Outlook Address Book into Thunderbird. Is there a solution?
A: It could be one of two things: Outlook is not set as the default email program or that importing large Outlook address books (with over 100 entries) causes Thunderbird to crash.

If it's the "Outlook not set as default issue", then this might help:
http://www.moztips.com/index.php?id=184

If it's the "Thunderbird crashes while trying to import large Outlook Address Book" issue, then this might help:

Here is a workaround: You can use Address Magic (made by Connected Software) to export your Address Book as another format (LDIF), and then import the LDIF file into Thunderbird. The Address Magic program is available from:
http://www.connectedsw.com/Overview/57262

Q: While composing a message in Thunderbird, I cannot change the font colors or size, or styling (bold, italics, etc.) What should I do?
A: This answer was posted on MozillaZine?: "It sounds like you are writing messages in text-only and want to do HTML. To do this, go to the Tools menu, then Account Settings. For each of your accounts, go to the Composition & Addressing section. Check the box labeled "Compose messages in HTML format." Now you should have all those font and image options when you write a new message."

Q: How can I read my Hotmail or Yahoo email using Thunderbird?
A: If you pay for one of Yahoo's or Hotmail's premium email services, you can access your email in Thunderbird by setting up a new POP3 account. If you do not want to sign up for Yahoo's premium email services, you can access your email in Thunderbird by installing a extension or a proxy program that sits between Thunderbird and Yahoo, and which relays messages from Yahoo to your Thunderbird inbox.

Extensions:

Shareware and freeware webmail proxy programs:


Q: I have trouble setting the SMTP server for my email account. Or: I get the error message: "relaying denied".
A: This series of answers might help: http://forums.mozillazine.org/viewtopic.php?t=69430

Q: How well does Thunderbird's built-in SPAM filtering work?
A: Gunnar has a good article on this: http://mozilla.gunnars.net/mozilla_spamfilter.html

Q: How do I configure Thunderbird's built-in SPAM protection so that it automatically detects and quarantines SPAM messages?
A: This tutorial at mozilla.org should be useful in explaining how to configure [government jobs] and use this feature: http://www.mozilla.org/start/1.4/extra/using-junk-control.html

Q: Is Thunderbird/Mozilla Mail susceptible to email viruses?
A: Thunderbird (and Mozilla Mail) do not open attachments or execute JavaScript automatically when a message is previewed or opened. This tutorial has further tips on protecting yourself against email viruses and email tracking mechanisms: http://www.pjls16812.pwp.blueyonder.co.uk/mozilla/index.html
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Site of the US government.

Q: How do I migrate my Thunderbird email and address book files from one computer to another?
A: There is a write up on this topic in the MozillaZine? knowledge base: http://kb.mozillazine.org/index.phtml?title=Thunderbird_:_FAQs_:_Changing_Profile_Folder_Location