Log Message:
Update to Thunderbird 1.5.0.2 (1.5.0.1 was skipped to stay in sync with
Firefox).

Thunderbird 1.5.0.2 offers improved stability, and several security fixes:
MFSA 2006-28  Security check of js_ValueToFunctionObject() can be circumvented
MFSA 2006-27 Table Rebuilding Code Execution Vulnerability
MFSA 2006-26 Mail Multiple Information Disclosure
MFSA 2006-25 Privilege escalation through Print Preview
MFSA 2006-24 Privilege escalation using crypto.generateCRMFRequest
MFSA 2006-22 CSS Letter-Spacing Heap Overflow Vulnerability
MFSA 2006-21 JavaScript execution in mail when forwarding in-line
MFSA 2006-20 Crashes with evidence of memory corruption (rv:1.8.0.2)
MFSA 2006-08 "AnyName" entrainment and access control hazard
MFSA 2006-07 Read beyond buffer while parsing XML
MFSA 2006-06 Integer overflows in E4X, SVG and Canvas
MFSA 2006-05 Localstore.rdf XML injection through XULDocument.persist()
MFSA 2006-04 Memory corruption via QueryInterface on Location, Navigator objects
MFSA 2006-02 Changing postion:relative to static corrupts memory
MFSA 2006-01 JavaScript garbage-collection hazards

For a detailed ChangeLog, see:
http://weblogs.mozillazine.org/rumblingedge/archives/2006/02/1-5-0-2.html