CentOS Errata and Security Advisory CESA-2011:0312
thunderbird security update for CentOS 4 i386: https://rhn.redhat.com/errata/RHSA-2011-0312.html
The following updated file has been uploaded and is currently syncing to the mirrors:
i386: thunderbird-1.5.0.12-35.el4.centos.i386.rpm
src: thunderbird-1.5.0.12-35.el4.centos.src.rpm