Article 6CMQ6 Thunderbird : deleting duplicates based on read/unread status?

Thunderbird : deleting duplicates based on read/unread status?

by
Herve5
from LinuxQuestions.org on (#6CMQ6)
[edit : this is solved! -see the end if need be]
Hello all,
My email supplier has 'updated' its services, and this results in the hundreds of emails on the server being re-tagged as unread (or maybe with a slightly different timestamp), rendeing them new for my POP readers here.
The net result is, within Thunderbird, I now have hundreds of duplicates, each time with one read and one unread.
I created a Thunderbird search filter that isolates the unread messages, but this doesn't help, because if I delete them, they'll be deleted on the server, which I cannot afford (we are accessing this server from different machines and can't empty it this way).
I would like in fact to delete, locally, 'the other ones' : those among the duplicates that are read, not unread. (Knowing that, of course, there are local read messages thar are not duplicated, so I cannot just delete all local read ones.)
I don't see a way within the Thunderbird Search to 'list all duplicate messages', like 'for which there is another message with the same title', or even 'for which the chronological next message has the same title' (then I'd kill among them the read ones).
Is there any such way to filter?
If not, is there a way to access directly my email database and filtering it this way?
[Edit : I found a solution, installing Thunderbird's 'Remove Duplicate Messages' addon. I had to adjust some of its numerous criteria, but indeed everything went well. ]
TIA!!
Hervi
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