Excellent E-mail client from the makers of Firefox

Thunderbird

Thunderbird 2.0.0.12 DownloadThunderbird 2.0.0.12 Date added: February, 27th 2008 - (Open Source)

What's new in this version:

The following security issues have been fixed.

MFSA 2008-12 Heap buffer overflow in external MIME bodies
MFSA 2008-07 Possible information disclosure in BMP decoder
MFSA 2008-05 Directory traversal via chrome: URI
MFSA 2008-03 Privilege escalation, XSS, Remote Code Execution
MFSA 2008-01 Crashes with evidence of memory corruption (rv:1.8.1.12)