Mozilla help page (at https://support.mozilla.org/en-US/kb/moving-thunderbird-data-to-a-new-computer) instructs users to use Windows Easy Transfer for transferring mail to a new machine

Where in the article 'Windows Easy Transfer' is mentioned?

I would appreciate any guidance that could help me get past this obstacle.

Simply follow the instructions from the article. If you do have a specific question, ask here.

"Where in the article 'Windows Easy Transfer' is mentioned?"

Sorry, "christ1"

If I click on that direct link the support page it says it is not found. But if I google search for "mozilla thunderbird how to transfer email" it gives that link as a search hit, from that search hit link I can get the page, and the top of that page is copied below. What is the first thing it says to run?

The largely-manual gmail workaround it describes is not terribly feasible with many categorized saved-mail folders.

Moving Thunderbird Data to a New Computer Table of Contents

   Windows Easy Transfer Wizard
   Manually moving files
   Using Gmail to move messages
   See Also

Windows Easy Transfer Wizard

Recent versions of Windows come with an Easy Transfer Wizard which offers to transfer your data, documents, videos and email to your new computer. The default settings for this transfer wizard do not transfer Thunderbird data to your new computer. However, it is simple to make the changes necessary to have the software move your Thunderbird data.

Once the wizard has finished the "Checking what can be transferred" routine, a customize option will appear under the account name. Click this option to open a dialog that provides access to advanced options.

If I click on that direct link the support page it says it is not found.

When you posted the link you did include a closing bracket. Remove that and the link will work. https://support.mozilla.org/en-US/kb/moving-thunderbird-data-to-a-new-computer

I can't help with the Windows Easy Transfer Wizard. Never used it, and probably never will.

Sorry about the link mess -- I just copy/pasted the url from my browser. I doubt I'll use Windows Easy Transfer Wizard again, either, if I can help it.

But I reckon I still have my original question. Thanks, anyway.

As said before, follow the instructions in the article.

I did. The results did not follow those described. (the system does not list Thunderbird as an option as shown) Hence my question.......