so, I have had this problem now about five days in the past 20. Overnight, mail which I have deleted, mail which I have EMPTIED from the iphone trash, mail which doesn't appear to still be on the yahoo server, so no other client receives them, and webmail doesn't show them. Overnight, it COMES BACK TO LIFE and reappears in my inbox? I wake up and have like 80 emails, from back at least a WEEK sometimes, all showing as new and unread. I have DELETED and PURGED these emails. I don't know how this comes back, where are they coming from? I have the strange feeling that there is a deleted and emptied database that caches everything and somehow they get put back? this is ONLY with my yahoo mail setup on the iphone, not gmail or mobileme. Anyone else have this problem? could this have something to do with the spotlight search/cache bug?