http://www.mozilla.org/security/known-vulnerabilities/thunderbird31.html#thunderbird3.1.18
http://www.mozilla.org/security/announce/2012/mfsa2012-01.html
http://www.mozilla.org/security/announce/2012/mfsa2012-02.html
http://www.mozilla.org/security/announce/2012/mfsa2012-04.html
http://www.mozilla.org/security/announce/2012/mfsa2012-07.html
http://www.mozilla.org/security/announce/2012/mfsa2012-08.html