You can sync the calendars on the two computers via a calendar server, e.g. like Google Calendar. The calendars on the two computers would then need to be set up as network calendars.

OK, thanks But the next question is, How do I set up the Calendars as a Network?

If you want to use Google Calendar see https://support.mozilla.org/en-US/kb/using-lightning-google-calendar

For another calendar server you'll need to look for specific instructions.

christ1 said

If you want to use Google Calendar see https://support.mozilla.org/en-US/kb/using-lightning-google-calendar For another calendar server you'll need to look for specific instructions.

Think we could be at cross purposes. I've loaded the events to my main computer "Thunderbird" Calendar. But when I look at my laptop "Thunderbird" calendar the Events do not show. Question:- Should they show on the 2nd computer? 2 What is method of getting them to show, if different from what has been posted.? Thanks

I've loaded the events to my main computer "Thunderbird" Calendar.

What does this mean? Please explain in detail the steps you did.

I opened up the Thunderbird Calendar Clicked on "Event", Set up the "Event" details & saved it Did this for all "Events" Went to "Events" list, clicked onto "Start date" & put the list into Start Date order. I can now see all "Events" as a list & also "Events" are showing on the Calendar on the requested days.

When I go to my other computer, a small laptop, & opened the Thunderbird Calendar the "Events" set in the main computer did not show. So my initial question was :- How do I update the Laptop & keep it updated with changes made to "Events" on the main computer. I've partially found a answer, this being that I've Exported, via a USB chip, the Events from the main computer, & Imported them to the laptop. So I now have the listing of "Events" on both computers. But, if I add/change an event on the main computer how can this change be reflected automatically on the laptop? Hope this explains

If you did that on your local calendar you haven't achieved anything in terms of synchronization between the two computers.

Did you read (and understood) the steps to create a network calendar?

I did, & was totally confused. Looks as if I would have to d/load some extra "add ons" Am I correct or have I missed the point?

Simply follow the instructions.

What instructions? You have only given information about Google Calendars I'm interested in getting both of my computers both using Thunderbird Calendars to show automatically event information & updating this information when a change to an event/or an event is added to either m/c

Google calendar is a network calendar that both computers can access. If you use Lightning then yes, the easy way to synchronize them is to use the Provider For Google Calendar add-on. A slightly harder thing to set up, which does not require an addon, is to use CalDav.

But in either case, you're using a common resource, a Google Calendar, which both installations of Lightning can refer to.

You don't have to use Google Calendar. Your ISP or email provider may offer a calendar too, but you'll have to find for yourself how Lightning can connect to it. The value of a Google Calendar is that it is also available to Android phones and tablets. I also use a calendar offered by one of my email providers (GMX) that works with CalDav.

The most private way I know of is to use an ics file and share it via Dropbox (or similar). However, this is not real-time synchronisation. A change made on one computer will not be visible to the other until the first has saved the change, closed and allowed the ics file to be uploaded, and the second has downloaded the ics file and opened Thunderbird. Think of it as a single calendar that is passed from one computer to another, so at any point in time it can "belong" to only one of the computers. This works in a situation such as having a computer at home and another at work; you never use both of them simultaneously.

Thanks to you both. I think it's complicated but I do understand.