I had to add a hack to shorten the build directory name for thunderbird 17.0.2esr: https://hg.mozilla.org/build/buildbotcustom/rev/6c60d3bc6fd7
Once bug 827304, we should remove it so we can have a useful directory name again.
I'll take care of this after the dependent bug is fixed.
This will end up getting backed out as part of the work in bug 827306.
*** This bug has been marked as a duplicate of bug 827306 ***