I do.
You are using a proprietary OPERATING SYSTEM. Do you know what an operating system is? It's a big complicated program that lets other big complicated programs live together in relative peace on the same system.
If you don't trust proprietary software, why the hell are you using a system that uses macOS?
This makes ZERO sense.
It does make sense, because while I basically trust that macOS is safe, secure, and not spying on me, I am not so sure that certain applications from Apple can equally be trusted.
For all I know, Apple Mail could be uploading my emails to iCloud.
May seem paranoid, but then that is why I asked if you trust it.
Not so crazy...
You didn't even bother to give even the most cursory glance at the app's menu.
What app are we talking about?
I DID look at what you said about File > New Address Book and I explained why it will not work.
Do you have the latest version of Thunderbird?
I do, and the menu choices won't help me because I'd still have the say issue of a global Address Book for separate email accounts.
If you're gonna berate me, at least be right on said topic.
And if I am still missing the obvious, then why not help me understand what you know that I do not...
And it looks like you have made zero attempt at trying to get some of your questions answered at a Thunderbird-specific user forum.
You seem to be stuck in the past...
The Thunderbird forums went offline last year. And I searched the KB and didn't find any obvious answers.
I hereby bow out of any further participation in this thread.
@Erehy Dobon,
Why ragging on me when I have researched things and tried to apply your advice?