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By Mozilla Organization  (Open Source)
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Thunderbird provides stability and security enhancements that are part of our ongoing program to provide a safer email experience for our users. We recommend that all Thunderbird 1.5.0.x users upgrade to this latest version.

MFSA 2007-40 Upgraded Thunderbird missing fix for MFSA 2007-23
MFSA 2007-29 Crashes with evidence of memory corruption (rv: