I'm assuming that you have seen this webpage: Importing from Eudora - Thunderbird. I add it here just in case you haven't, and so if people come across this thread, they will see it.

What you need to do is delete the files from the computer from the previous import run.

1. Quit Thunderbird.

2. Use Windows Explorer to go to "C:\Users\Tedslap\Appdata\Roaming\TB\Profiles\cguy9n9c.default\Mail\Local Folders\"

If you cannot see all file extensions (the three or four letters after a period after a file name, like .exe, .msf, etc.), then you will need to change an option in Windows to show them: Click "Tools" in the menu bar for Windows Explorer, then "Folder Options". Select the "View" tab, then un-select the option "Hide extensions for known file types".

3. In the folder mentioned, look for files and folders labeled "Imported mail", and delete them. There probably be a file "Imported mail" with no file extension, a file called "Imported mail.msf", a folder called "Imported mail.sbd", and a folder called "Imported mail.mozmsgs". Delete all four of these.

Then start Thunderbird again and try the import again.

Hi Bruce,

Tried this but kept getting a previous run of data. I finally figured out that my "newer" data was in the TB chain of libraries while the system was updating from the Mozilla set of libraries. Since I was not updating the Mozilla libs. the run never changed. See other item on getting the wrong Profiles.

Thank you, Ted

Mozilla is an organization. Thunderbird and Firefox are programs provided by Mozilla. So saying something on your computer is to do with Mozilla rather than Thunderbird or Firefox, doesn't make sense to me.

So I do not understand your reference to "Mozilla profiles", as opposed to Thunderbird profiles or Firefox profiles. As far as I know, there is no such thing as a "Mozilla profile".

Also I do not understand what you mean by Mozilla or Thunderbird "libraries". The term "libraries" is not used with respect to Thunderbird.

Please read these articles to understand what a Thunderbird profile is: Profiles - Where Thunderbird stores your messages and other user data Profile Manager

With that knowledge, hopefully you can understand situation better and rephrase things so that I and the others here will understand you better.

Feel free to add screenshot images to your posts to illustrate what you are talking about if they might help. How do I create a screenshot of my problem?

I just now briefly looked at your old questions from last year on this subject, but rather than pay much attention to them, I would prefer to focus on your current situation.

Yes, you definitely need to start making regular backups of data that is on your computer. As a computer tech who has seen many people lose their data, I cannot stress enough the importance of doing regular backups. If it is important to you, back it up regularly or expect to lose it!

An easy way to do regular backups is to use an external hard drive that has a backup program included (external backup drive). If such a drive is always plugged into the computer, then the included program will keep the backup constantly up-to-date. Or you can plug in the backup drive once in awhile, and the backup program will automatically update the backup. Also, such a backup drive can be used with multiple computers (as long as all the data fits in the space available on the backup drive, of course).

On the subject of new "profiles":

I suggested creating a new Thunderbird profile in response to this particular question (above), because you said you were not seeing any profiles to choose from when you launched Thunderbird. You said you had to recreate one every time. Perhaps what you referred to as a "profile" is not what I am talking about "profile", or I somehow otherwise misunderstood. Again refer to the links above regarding Thunderbird Profiles.

A new Thunderbird profile creates a whole new separate "dataset" for Thunderbird. As you have observed, this means that e-mails (and everything else), in one Thunderbird profile, is not in another Thunderbird Profile.

I sure hope I have explained things so you can understand!

By the way, my one of my favorite sayings is, "Never stop learning".

Fudge! It appears I posted my response to the wrong one of your questions. I meant to post this response to: https://support.mozilla.org/en-US/questions/1152974

I will do that now.

The questions are logically linked, though.