Thanks for the suggestion about searching for "calendar" instead of "agenda", I'll give that a try.

If all else fails, I'll just keep using the online gmail agenda, no biggie. Lightning indeed is pretty awful as I have noticed over the last couple of days.

I would like to try Sunbird, but when I click on the Windows, English link, this is what I get: click. So I'm guessing Sunbird doesn't exist any more?