I believe the intent is that email programs could use the headers intelligently to provide menus or buttons right within the program for a user to unsubscribe or query for help. It would be really nice to see Microsoft and other vendors support this functionality in their programs to make this easy. If vendors would jump on board with this, I think things would work much better. Almost every email list I subscribe to are providing such headers and are doing so in a consistent manner. Some of the lists, instead, add standard footers to every message sent to list subscribers that includes info on how to unsubscribe.
Some people are just plain clueless.
I think the real solution is getting the email vendors to have their programs deal intelligently with the appropriate mail headers. I know I'm going to get about 5-10 such replies in response to this post. Sorry about the off-topic post. I'll say no more about it. Do the planet a favor.