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: Pentium 233 MHz (Recommended: Pentium III 500MHz or greater)
• Operating System: Windows 98 or above (Windows XP or above recommended)
• Memory: 64 MB RAM (Recommended: 128 MB RAM or greater)
• Disk Space: 52 MB

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