yeah, I suggest you have a look in your account settings. Have a look at this "other account". Thunderbird has a built in local folders account. Folks for reasons I do not understand rename the account from "Local Folder" to their email address. From there it is all down hill because it is not "just" another account. Have you renamed your local folders?

If you have when you select the account in account settings it will tell you this is a special account. It will also not have server settings etc listed under it. Just junk and Disk space.

I had never renamed the Local Folders account and it still exists. When I changed from "Inbox for another account" to "inbox for this account" Thunderbird created a new folder called "Home Email". Suddenly, my email was going to that folder instead of the Local Folder. Although I moved all the email out of that folder, switched back to "Inbox for another account" ,and did a Thunderbird merge to merge Home Email and Local Folders, it will not let me delete this new Home Email folder. When I go into Settings, this new Home email shows up as the name. I could rename to Local Folders, but it doesn't go away or give me a delete option, no matter what I do.

Wow, just shut down and restarted Thunderbird again and the new "Home Email" folder went away. The one remaining oddness is that when I go into Tools>Account Settings, the name at the top is this "Home Email". I just renamed it "Local Folder" and hopefully all is well.

I would say it has been called home all along and your change prompted the appearance. Folder names in Thunderbird are cached and unless something changes are not regenerated. The something in this case was probably your change.

A restart of Thunderbird is often required to reflect major folder changes.