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Michael Press

In article ,
wrote:

He chose it because it put special emphasis on the phrase as the OP
probably did. By the way, changing the title loses the thread and
starts a new one, which is also none too good for tracking where the
discussion arose.

No, changing the subject header does not change alter the
threading. The References header and In-Reply-To header
maintain integrity. A correctly written news reader is
capable of displaying the list of articles according to
the References headers. Still the user must choose to
display the available articles according to threading if
that is what he wants, and not depend upon the article
Subject headers to organize the threading. Changing the
Subject header in a sub-thread is permissible, even
preferable, in many cases.

--
Michael Press