Thunderbird Updated

Thunderbird 2.0.0.21 is out.
The security fixes are listed here
MFSA 2009-10 Upgrade PNG library to fix memory safety hazards
MFSA 2009-09 XML data theft via RDFXMLDataSource and cross-domain redirect
MFSA 2009-07 Crashes with evidence of memory corruption (rv:1.9.0.7)
MFSA 2009-01 Crashes with evidence of memory corruption (rv:1.9.0.6).