From this CNET article...
"Among its features is one that lets users "mute" an e-mail thread that they are no longer interested in being part of."
Sweet, sweet mana from heaven! I can now take refuge from the "shock and awe" Reply All tsunamis that seem about a weekly occurrence inside Microsoft. Unfortunately, this feature is only available right now via the web version of Outlook (or I am missing something). Can't wait for the next version of Outlook so I can start dropping out! ;-)