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:
Beta programa zure ohiko programen karpetan instalatu baduzu (goiko 1 aukera) eta <a href="https://support.mozilla.org/en-US/kb/dedicated-profile-thunderbird-installation">Thunderbird profil berezia</a> erabiltzen baduzu, orduan abiarazi Thunderbird bertsio egonkorra eta zure egonkor-profileko datuak erabili beharko ditu. Beta bertsioa erabili nahi ez baduzu, eta beta daturik behar ez baduzu (helbide-liburuak, karpeta lokalak, pop karpetak, etab.), eta zure sistematik beta eta beta datuak kendu nahi badituzu: