At 04:03 PM 4/12/2011, Rex wrote...
Email message headers contain a thread-index number. Any decent email program groups the messages into threads using this (normally hidden) information.
The Thread-Index: header (and Thread-Topic:) is a completely proprietary, non-standard header created by Microsoft. From that, "decent email program" does not follow.
The correct header to use is References:, as defined in RFC 1036 (and RFC 2822), and to a lesser extent, In-Reply-To:, which is a mess.
But, since both References: and In-Reply-To: were very loosely defined when originally created in RFC 822, threading is, and always will be, unreliable.
The OP apparently replied to an existing message and put a new subject in. His MUA put in fresh Thread-*: headers, and handled References: and Reply-To: properly. Your MUA used the updated References and/or Reply-To to place that message into an existing thread.
None of that is unreasonable, none of it violates standards, yet it breaks threading, because support for threading was never properly specified to begin with. Pointing fingers at someone is misplacing blame, and pissing into the wind, too.
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