Hi, We are using Outlook 2003 SP2 client with Exchange 2003 SP2 server. Sometimes the "Out of office assistant" turns on by itself for a few users. They change it to off in Outlook or OWA ,but it turns on again. I see warning messages in Exchange application log regarding "Out Of Office rule" for those users: Source: MSExchangeIS Mailbox Store Event ID: 1158 Description: Action 0 in rule ID 1-53B782 was stopped. An Out Of Office rule cannot be triggered on messages with auto response suppress. Any help will be appreciated -- Regards Alex