I use Thunderbird on my MacBook. I've never activated, much less used, Apple Mail. I cannot delete old addresses in my address book. Many people have multiple addresses, mostly duplicates, some outdated. I can add new ones. When I write an email, I must go -- sometimes scroll -- down a list of addresses to chose the right one, assuming I remember which one that is. My guess is that Thunderbird is populating the Apple Mail address book with addresses, but since Apple Mail hasn't been activated, I can't see how to even check out this theory.
What's going on and how do I fix it?
What's going on and how do I fix it?