I run OL2002 SP3 on a Windows 2000 Server. I have 4 email accounts defined in Outlook - 1 Exchange mailbox and 3 POP3 mailboxes that are hosted on an ISP. I have 4 rules defined, one for each email account. All the rules have the same form - when a message arrives through the specified account move it to the designated public folder. These rules run flawlessly for a while and then a "Rules in Error" box pops up and processing for the rule that failed ceases. Restarting Outlook, running the failed run manually resolves the problem. I'm thinking this is a speed issue in that this Inbox is very busy and the rules may be running too fast or too slow. I have tried recreating the rules, reordering the rules, nothing has helped. Microsoft hasn't been of much help either. My client is after me to fix this NOW.