Lightning is a free, cross-platform extension for the Mozilla Thunderbird email client. This is not a stand-alone program, it adds a calendar tool to Thunderbird, which must also be installed on your computer.

• Software Requirement: You must have the Mozilla Thunderbird client installed on your computer
• Computer/Processor: Intel Pentium II or AMD K6-III+ 233 MHz CPU (500MHz or greater recommended)
• Linux Kernel: 2.2.14 or above with glibc 2.3.2, XFree86-3.3.6, gtk+2.0, fontconfig (xft), and libstdc++5 or above.
• Memory: 64 MB RAM (128 MB RAM or greater recommended)
• Disk Space: 52 MB

Mozilla Lightning is available at no cost through the Mozilla Lightning Web site.