John, the reason why it looks like a Thunderbird bug is that it appears
that the Thunderbird package installs a thunderbird and a mozilla-
thunderbird link in /usr/bin, both pointing to
/usr/lib/thunderbird/thunderbird. If you remove the mozilla-thunderbird
link, it resolves the problem. So steps to reproduce:

cd /usr/bin
sudo ln -s ../lib/thunderbird/thunderbird mozilla-thunderbird

If you now go to System -> Preferences -> Preferred Applications, you
will see both a "Thunderbird" option and a "Mozilla Thunderbird" one. If
you remove the /usr/bin/mozilla-thunderbird link, the second option
disappears from preferred applications.

It looks like the /usr/bin/mozilla-thunderbird link that is created when
installing the thunderbird package is superfluous. Or is this the
intended behaviour and does it mean that the preferred applications
preference tool should show only one option even if both links are
present?

-- 
After installing Thunderbird, preferred applications shows both "Mozilla 
Thunderbird" and "Thunderbird"
https://bugs.launchpad.net/bugs/373167
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