[Mozilla.org Thunderbird 1]

Please see here for a freely downloadable MSI package of Thunderbird 1.5.0.4:

http://www.zettaserve.com/default.asp?catid=55

Features of this package include:

- Free of all Windows Installer ICE Validation Errors.

- Fully supported under many corporate Microsoft Windows based software package deployment solutions including Microsoft Active Directory, Microsoft SMS, Novell ZENworks and Altiris.

- Allows deployment to non-Administrative users providing usability on typical "managed" (locked-down) environments.

- Allows unattended installation. No user intervention is required.

- Full upgrade support for previous Thunderbird MSI packages (no need to uninstall old versions first)