I'm running Thunderbird 24 on Ubuntu 12.04 64 bits. I have installed the Conversations extension, in order to group and visualize conversations based on threads, in a similar way to what gmail does.

It works fine, but it seems to depend on Thunderbird's internal native thread grouping mechanism, that is itself a bit flawed. In the example below, this thread include four different subjects.

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I know many will say the threads are grouped based on an internal flag and if a contact of mine lazily uses a previous message, click reply to obtain the address list of an existing message and use it as a basis to compose a new message, with a different subject, then the new message will be automatically threaded as a child of the original message.

The problem is:

  1. I can't educate ALL my contacts. Simply impossible;
  2. Thunderbird is grouping messages with different subject lines
  3. I have received automatic messages from external services, (meaning it's impossible they had hit "reply" on a previous conversation) and even then it gets grouped on a wrong thread.

Is there a way for me to improve the way Thunderbird will group threads? Or alternativaly a way that I can manually exclude and include messages from threads (that doesn't involve having to manually edit headers)?


It seems to happen frequently when I move threaded emails from a folder to another.

Solved by a simple two-step operation :

  1. Compact the folder this thread is in (right-click then compact).
  2. Repair this folder (right-click then properties).

You should try to repair first, but for some reason it may fail. Then just compact & repair.

  • @ThatBrazilianGuy Thanks for the rewrite, it's more clear now. Did you find a solution for your problem (two years ago, indeed), if yes what is it ?
    – Benj
    Apr 3 '15 at 13:41
  • Yeah, a great feature of the Stack Exchange site is they are technically a "wiki". Sometimes people are a little OCD in their edits, sorry if it's the case ;P Apr 3 '15 at 15:51
  • About my problem, I had simply given up organizing conversations in threads / folders and simply using "inbox" and "archived". I will try your suggested solution (on a huge folder, it might take a while...) and accept the answer if it works! Apr 3 '15 at 15:52
  • Did you try this ? (and does it work ?)
    – Benj
    May 5 '15 at 10:08
  • Compacting is quick, but repairing takes ages on large folders.. is their any better fix to this problem?
    – kapad
    Sep 9 '17 at 23:21

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