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Thunderbird  edit   (Category  edit) .

[edit] Backing up your profile

http://www.communitymx.com/content/article.cfm?cid=B084C Transferring Emails, Email Account Settings and Bookmarks From Mozilla Applications

http://mozbackup.jasnapaka.com/ MozBackup

[edit] Combining two profiles

http://kb.mozillazine.org/Combining_two_profiles Combining two profiles - MozillaZine Knowledge Base

http://nic-nac-project.de/~kaosmos/mboximport-en.html MboxImport extension