Search feature: It appears I can only search for e-mails in one mailbox at a time. How do I search multiple mailboxes at once?
• Instead of using the find box in the top right corner of thunderbird, use the advanced find feature… • In Thunderbird, click Edit > Find > Search Messages (CRTL+SHIFT+F) • Select the top level of folders you’d like to search in. • Check the “Search subfolders” box to search all subfolders. • Specify your search criteria.