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Tbird's threaded view is nowhere near as intelligent as Google's threaded view. When an email client arbitrarily adds a "Re:" is messes it up. Conversation-style view is more or less useless when split up among multiple conversations.

Or at least this was my experience this summer.

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When an email client arbitrarily adds a "Re:" it messes it up.

I'm pretty sure Thunderbird uses the Message-ID and In-Reply-To headers to create the threads, not the subjects. But some people don't always use the Reply function, or Reply to an old email when they want to start a new conversation. Maybe Gmail has some logic to get around these limitations.

In Thunderbird 3, we use a combination of the two models, as some mail providers (Yahoo! for example, IIRC) strip away the right headers. Thunderbird 3's threading is way better than Thunderbird 2's.

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