For TB 102, try adding iCloud with these two add-ons:

https://addons.thunderbird.net/en-us/thunderbird/addon/tbsync/

https://addons.thunderbird.net/en-us/thunderbird/addon/dav-4-tbsync/

https://support.mozilla.org/en-US/kb/installing-addon-thunderbird

I am using Thunderbird version 115, these are for 102. will they work?

Versions for 115 are being developed:

https://github.com/jobisoft/TbSync/issues/669

Thanks for all your help, Any idea on timing?

Watch the github forum for updates. It mentions a beta version for 115.

Github forum? how do i access it?

The link is in my second reply.

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