Learn the Basics. Get Started Сите All articles and threads In English Thunderbird and Gmail The difference between IMAP and POP3 How to change the Thunderbird layout Getting Started with the Thunderbird main window (Supernova and newer) Installing an Add-on in Thunderbird Make Thunderbird the Default Mail Client Ignoring threads Getting started with Thunderbird Protect your Thunderbird passwords with a Primary Password Cannot send messages Getting started with the Thunderbird main window Dangerous directories Unified Toolbar Maildir in Thunderbird Thunderbird Accessibility Features Thunderbird end of Support for XP and Vista New in Thunderbird 102