I'm currently running the exim-qpopper-mysql-0.11.2 patches against qpopper3.1.2- Thing is, I have to support many users with large mailboxes that are left on the server. The disk IO is killing me.
I think the easiest solution is to go to a maildir mailbox storage system. The only maildir patch I've found for qpopper is for version 2.x. Has anyone updated the patch for 3.x? If not, I'm going to give it a shot.