A new version of Thunderbird, version 2.0.0.23, is available. Thus update fixes MFSA 2009-42 (Compromise of SSL-protected communication).
If you are a Thunderbird user, it is probably best to apply this update as soon as convenient.
Note that, It appears this update, which affects multiple Mozilla products, has changed the rules for security certificates generated with wildcards. More information is available at the Fourmilab Blog.
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Tags: mozilla, thunderbird, open source