So, I'm using Mozilla Thunderbird (actually it's Tenfourbird, which is Thunderbird 39 that works on old Macs, but it's the same really). I'd like to be able to sync my iCloud calendar and contacts with it. However, I can't get it working. I know how to connect to a CalDav server and where to type it in Thunderbird, but I don't know what the server is. I've tried looking this up, and I found a website with instructions on how to do this, but the instructions were not the easiest to understand and I couldn't get it working. Does anyone know the iCloud CalDav server and how I can get full read/write access in Thunderbird?