The sweep feature should include keeping the present email in Inbox and moving the rest from that sender to specified folder. (Example: I may want to keep in inbox the latest from teacher, but move the rest to a folder labeled, school, instead of deleting them or archiving all of them.)
lets just get rid of sweep..it sucks big time
Sanjeev Shrestha commented
the sweep functionality to keep the last message doesn't seem to work all the time. i have folders with multiple emails from same sender during the course of time even though when i added rule to only keep last one.