There is no lightning, it is not required in 78 as 78 has a built in calendar.

Understand that the calendar is built in to Thunderbird. And Lightning does not appear in add-ons for 78.6.0. That said, with 78.6.1 and NOT 78.6.0, the Thunderbird Calendar failed to communicate with or update or be updated by Google Calendar via Provider for Google Calendar thereby disconnecting my PC from Google, my phone and my other (2) pcs. Something changed. I'm looking for an answer that will let me communicate as I did before the latest update. Any help in that regard would be appreciated.

The Provider add-on has a habit of making the calendar disappear, but removing the add-on and reinstalling it usually fixes it:

https://github.com/kewisch/gdata-provider/issues/133

Had to do it twice, but it worked. But.... when I reopened Thunderbird after being away from my desk for a couple of hours, no calendar again. It took disabling and re-enabling Provider (didn't have to reinstall) in order to get the calendars back. Problem still exists, and I still don't know if its Provider that's losing the connection or Thunderbird. Either way its a pain

Try the alternates to Provider: TbSync/Provider for CalDAV & CardDAV or direct CardDAV:

https://support.mozilla.org/en-US/questions/1304356#answer-1368791

The TbSync combo has the advantage of including Contacts sync.

thunderbird 78.6.1 built in local calendar can't edit event descriptions

Hello,

I did use the lightning calendar, but apparently that is disabled/gone now. I still want to use the local calendar, but have 2 problems.

1) I cannot find the descriptions etc from the old calendar anymore 2) I created an event, every month event, with a reminder. I cannot edit the description for "this event only"

   (this is for the local/built in calendar in thunderbird 78.6.1)

is it a bug?  was it fixed?  or is it just a messed up setting I have?

thanks,

Ron