Using Thunderbird Mail. What are my calendar options??

I recently bagged my Microsoft Office,(Outlook) in favor of Mozilla Thunderbird mail.  
As a result it looks like I had to give up my calendar.  What are my options for a similar calendar with Thunderbird?  Is there an add on?  Something else?
Who is Participating?
BrandonGalderisiConnect With a Mentor Commented:
I don't know honestly.  I don't use it for that.  I strictly use it to view/update my google calendar... and i get invitations through gmail (separate account) for that.
Lightning is a good integrated calendar for Thunderbird.  That's what I use.  I also use Provider for Google Calendar to sync my calendar with my google calendar(s) since that's where my iPhone syncs.
marchopkinsAuthor Commented:
Wonderful, I just added it.  Is there a way to accept a meeting invitation like in outlook?
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