Michael Schwendt wrote: >> Did this work? I used the somewhat hidden "Reply to List" button. > It did not work. See my previous reply. Since you reply to a digest > message which doesn't contain the necessary mail headers, your mail > user agent cannot maintain these headers. WFM .. using <blush> OE. Don't think it's just subject line. I suspect outlook still breaks threads in some versions, but OE seems to manage.