Comment 3 for bug 918763

The last good build of Thunderbird on Lucid x86_64 was 12.0~a1~hg20120103r9103.83671.

The first build confirmed with this failure is 12.0~a1~hg20120118r9213.84699.

That is a fairly wide window, but unfortunately, we aren't doing daily builds anymore for Lucid and there were other failures in between.