Anti-Dupe for Microsoft Outlook is a simple Microsoft Outlook add-in that allows you to delete unwanted duplicate records in your Microsoft Outlook Mail, Calendar, Contacts and Tasks folders. Anti-Dupe for Microsoft Outlook deletes duplicate records based on pre-determined criterion set by Anti-Dupe. Although the criterion that Anti-Dupe for Microsoft Outlook sets isn't customizable, you can choose which Outlook folders to scan. Free trial.