Since part of the screenshot is blurry, I must make assumptions. My guess is that is a unified view on top. If so, the appearance of the same account lower down would be because that account has one or more folders that are not unified. That is, folders with names that are not used in folders of the other accounts. The intent of Thunderbird is to make all folders viewable. When a user selects the unified view, Thunderbird then adds the account again to display the other folders.

What david said, but not exactly. You're using Unified Folders view. Thunderbird only unifies the special folders that have a pre-defined role, not any other custom folders each of your mail accounts may have. So even if you had the same folder in multiple accounts, if that's not one of the special folders that Thunderbird knows about, it will still not unify them… which means it must display them some other way… and that other way is the same way it would use to display them if you were using the All Folders view, i.e. under the account each of those folders belongs to, below the unified folders.

Moreover, depending on your account settings, you may have special folders that you would expect to be unified not unified and hence appear separately under the corresponding account. This may happen, for example, if you have a Spam folder on the server, but have told Thunderbird to store junk mail in a folder called Junk. The Spam folder won't be treated as a special folder by Thunderbird in that case, and hence appear under the account instead of under the unified Junk folder.

Some people find all of this quite confusing and prefer to use All Folders view mode for consistency. I personally prefer Unified Folders, but that may be because I find that view consistent as well… once you understand how it all works… :)

You guys appear to be correct...thanks.

If I expand the 2nd instance of the flagship@mc... folder the only subfolder there is a Drafts folder (see attached image). But I haven't figured out what's different about it that puts it there. (The other accounts' Drafts folders appear under a Drafts main folder in the list of unified folders.)

The second attached image shows the Copies & Folders settings for the Draft folder for flagship@mc...

Any ideas why Drafts isn't a unified folder in this case?

That folder appears to have been correctly flagged as the Drafts folder for the account, and there is no corresponding folder in the unified Drafts folder… It could be a glitch, I do regularly see Thunderbird doing strange things like that when changing settings, restarting Thunderbird should fix it if that's the case.

Thanks, I'll try that. If that doesn't fix it, my life will likely still go on.<g>