Mozilla’s Thunderbird email application is more powerful than ever. It’s now even easier to organize, secure and customize your mail. Thunderbird features many new enhancements to help you better manage your unruly inbox, and stay informed. Thunderbird scales to the most sophisticated organizational needs while making it easy to find what you need.
Windows x64 (AMD64 or x86_64) build doesn't work on 32bit Windows even if you use processor that supports Intel EM64T or AMD64. If you want to use this, you have to install Windows x64 version.
About Thunderbird/Daily 64bit
Thunderbird - 64bit software