We have a laptop that is running XP and Outlook 2003. When an email comes in with an attachment and you highlight the item to view in the viewing pane, the system becomes unresponsive for about 2 minutes. CPU utilization is at or below 2%. The laptop has 2GB of memory and menory utilization is less that 20%. Once this has occurred, then any email that is view "stalls" the system. A restart is the only way to recover normal operation speeds.