Hi all, I have factory installed XP Pro, with Outlook 2002 SP-1. I do daily/weekly maintenace with Norton System Works, and haven't installed any new programs etc. I have a new problem, where I can read, but can't delete, or transfer mail in one inbox-folder, folder size is 37,540 KB. I get the following popup: "The messaging interface has returned an unknown error. If problem persists, restart outlook" I am not using any rules, and I can delete/transfer mail in all other folders. I've run "Detect and Repair" 2 times, and several times "Inbox repair tool". I have no "unreparable errors". I've tried "edit/delete"..."shift/delete", clicked "delete X button", all give me the same message. How do I fix? Appreciate your help, -RJ

Create a new Outlook profile in the control panel/mail icon, then import everything from your old profile. May be a damaged profile.