I tried installing Thunderbird 2 from Fedora Core 6 Development Respository, the file actually belongs to currently in development Fedora 10. Yum / Yumex required that nss package be updated too in order to update Thunderbird. The update went through fine but the software couldn't be run because of initialization error in libgfx_gtk.so and I couldn't find any help on the net either.
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