On 31/03/2006, at 0:02, Jacob Rus wrote:
One good algorithm is described here: http://www.jwz.org/doc/threading.html I believe there are several open-source implementations of this algorithm, but it wouldn't be too hard for Apple to write one.
Even just pairing up in-reply-to with message-id would be enough, most of the time. Hardly much algorithm in that, and Mail.app used to behave this way before Tiger, as Allan also noted. It sucks that they took that out (although some people claim it till works for them).
-- Sune.