If you installed the beta program into its own program directory (choice 1 above) and you used a <a href="https://support.mozilla.org/en-US/kb/dedicated-profile-thunderbird-installation">dedicated profile per Thunderbird</a>, then start the release version of Thunderbird and it should use your release version profile data. If you no longer want to use the beta version, and do not need any of the beta data (address books, local folders, pop folders, etc), and wish to remove the beta data and beta program from your system:
If you installed the beta program into its own program directory (choice 1 above) and you used a <a href="https://support.mozilla.org/kb/dedicated-profile-thunderbird-installation">dedicated profile per Thunderbird</a>, then start the release version of Thunderbird and it should use your release version profile data. If you no longer want to use the beta version, and do not need any of the beta data (address books, local folders, pop folders, etc), and wish to remove the beta data and beta program from your system: