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I think Gmail is the first webmail provider that features the Conversation -- having only one mailbox entry for messages in the same thread. Neat.

However, a downside to this is that when you edit the subject just a wee bit (even just one character), that new message breaks apart from the rest of the Conversation and itself creates a new thread. Yes, changing the subject does have its benefits.

Can I put together several related messages into one Conversation?

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up vote 5 down vote accepted

This is by design, so it is not possible. There is no mechanism to merge conversations and the only way to split a conversation is to change the subject, even if it's only one character.

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Your answer is correct, but I want to vote down the content... there should be a way to merge conversations. – keflavich Nov 3 '11 at 16:07
I agree, it should be possible to move a message into a conversation or move a message out of a conversation that doesn't belong there. And sometimes I want to update the subject line without having it start a new conversation. I should have that option. It's limitations like these that sometimes tempt me to switch back to using a local app like Thunderbird... – Tyler Rick Dec 27 '12 at 18:55

Yes, you can.

If you want to put two e-mails together into a conversation, forward one of the e-mails to yourself using the subject line from the other e-mail.

It's not pretty (it obscures the original sender a bit, as well as the timeline if you do it after other messages in the conversation roll in), but it works.

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