Thunderbird : FAQs
From MozillaZine Knowledge Base
E-mail Account Setup
Sending and Receiving Mail
Organizing and Finding Messages
Reading and Printing Messages
Using the Address Book
Profiles: File Locations, Migration, and Backup/Restore
Your e-mail, address book, settings, and other info are stored in your profile.
See the Mail section, above, for info on composing, organizing and finding, and other newsgroup basics.