Outlook profiles should sort the problem, provided that you're using an Exchange Server and each user has their own mailbox. Add the profiles (Outlook must be closed) Right click the Icon/Properties/Profiles and add users. Then set up Outlook up to do a profile selection when Outlook is launched. If I remember correctly it's in Tools/Options/Mail Servies/ Prompt for a profile to be used, so you'll have to go into Outlook under one of the profiles, select the Option and restart Outlook. (Not too sure how it works with Internet Mail in which case the rules suggestion would probably be your best bet)