Try using the import export tools.... they take the need to know out of the process.

https://addons.mozilla.org/en-US/thunderbird/addon/importexporttools/

I tried to implement the suggestion, but the program would not install!

Vumbo said

I tried to implement the suggestion, but the program would not install!

It is an add-on not a program. So if you are treating it as a program there is no expectation it will do anything.

Read this. https://support.mozilla.org/en-US/kb/installing-addon-thunderbird

Why bother answering if you're not going be helpful?

Vumbo said

Why bother answering if you're not going be helpful?

You now have instructions for installing the add-on into Thunderbird. How about reading the information and acting on it instead of complaining I am not holding your hand as you apparently think I should.

If you have followed those instruction without success, I suggest you offer diagnostic information about exactly what went wrong or what error messages you saw. "I tried to implement the suggestion, but the program would not install!" says exactly nothing more than you had no success. No one can guess what happened on your machine with you in charge. I tried to guess you simply did not know how to install an add-on. If I was wrong, the ball is in your court. Offer some information that might move this from a guessing game to moving along with facts.

I regret disturbing you. Please give me the steps to install the add on you suggested.

Matt gave you a link already. It's the same one I'd have given.

https://support.mozilla.org/en-US/kb/installing-addon-thunderbird

That article is very much based on one I wrote and presented on my own website. So I'd be grateful for feedback on how it might be improved.

What is your site's address?

Oh my goodness. You could go to my profile via my link above and it tells you there.

It's so very hard to help someone who won't help themselves.

But I was seeking comments on the official help page - here - and not on my own site. We want to know in what way the proffered help fails to help someone.

Thanks for the response. Even though I have a STEM background, PhD-EE, and am capable of getting into the gee whiz weeds of software, rather than spend time on the picks and shovels, I would rather spend my time using the tools to mine for gold, i.e., manage a substantial stock portfolio which is extremely time consuming to do even passably well.