Add a complete calendar to Thunderbird
The one thing that most Thunderbird users miss is a complete and integrated calendar - well your wait is over if so.
Lightning has been timed to coincide with Sunbird and readily integrated into Thunderbird complete with organizer, task list, reminders, alerts and calendars. The look, feel and functionality are undoubtedly similar to Microsoft Outlook and likewise, you can add events and invite others to important meetings and events. However, for my money, the developers here have followed Google a little too closely. It feels very much like Google Calendar in use although admittedly, it's got more advanced scheduling and event detail options. Of course, Mozilla have taken much of Sunbird - their standalone calendar - and placed it in Lightning so if you're a Sunbird user, you'll find Lightening very easy to learn and pickup. The good thing is that Lightning is much lighter on your memory and of course, integrated perfectly into your e-mail so you don't have to operate two separate applications.
Sunbird, Google Calendar and Outlook users will find no major innovations in Lightening but it does bring a much needed add-on to Thunderbird.
User reviews about Lightning
by Anonymous
Adds Calendar Function To Thunderbird.
If you like Thunderbird but feel it needs a little more like a calendar then Lightning is a necessity. Lightning adds calendar functions without need to install a calendar app on your computer. You can even add events to Lightning making it the perfect Calendar add-on for FirefoxThe only issues with Lightning is the fact Lightning can cause Thunderbird to open slower, It can cause Thunderbird to crash and the file size is pretty large for an add-on.I myself prefer using Thunderbird's Lightning over all other calendar options because it does as much as the others but doesn't need to be installed on your computer.
Pros:
Adds Calendar Functions To Thunderbird
Customizable Events
Free
Cons:
Can Cause Thunderbird To Open Slower
Can Cause Thunderbird To Crash
Large File Size For An Add-on More