If you installed the beta over the top of the release version (choice 2 above), then your process will be more complicated. Please consult this <a href="https://support.mozilla.org/kb/thunderbird-beta">beta support article.</a>
If you installed the beta over the top of the release version (choice 2 above), then your process will be more complicated. Please consult this <a href="https://support.mozilla.org/kb/thunderbird-beta">beta support article.</a>