...I know bumping up ones own message is not much appreciaced on fora. I'll do it only once. I tried to provide as much as possible info. Maybe too much?

I don't know if you'll get an answer. Yours could be a unique use case.

Being able to store anything and everything doesn't strike me as a good reason for doing so.

Yours is not a unique case because, I, too, have the same problem with not only duplicate messages, but triplicate and quadruplicate messages appearing out of nowhere. It's getting so bad that the computer crashes when I try to run the "remove duplicates" program. I'm not getting any responses to my question in this forum and if this doesn't get resolved soon, I will have to go to another email program.

I'm also having this problem and my computer also crashes when I run the remove duplicates add-on. This has been going on for months and I'm not getting any answers from the forum. This is not a "unique problem". I am beginning to use another email program because of the many frustrations I am experiencing with TB. I also never received an answer to an earlier question regarding restoring my address book contacts that were accidentally deleted. I did install the add on that was supposed to help with that, but it did not come with any instructions and I still don't know how to recover my lost addresses. Any information on both of these issues would be helpful and very much appreciated. I would like to keep TB but it's becoming too much of a problem if these issues can't be resolved. Thanks.