The Mozilla Foundation this week released new versions of its Thunderbird mail client and its namesake Mozilla browser suite that both plug security holes.
Thunderbird 1.0.2 -- there was no 1.0.1 version -- essentially keeps it even with Firefox on security fixes.
The full list of fixes in both Thunderbird and Mozilla can be found here.
Mozilla is on its last legs as far as the foundation is concerned. Although it will continue development and support of the 1.7x line, the foundation is handing over the keys to an embryonic group that's calling itself Seamonkey for the moment.
Thunderbird 1.0.2 and Mozilla 1.7.6 can be downloaded from the Mozilla site free of charge in versions for Windows, Mac OS X, and Linux.