Outlook [LookForDuplicates] is a tool to identify duplicate items in Outlook.
It searches for duplicate entries of any type (calendar, contact, e-mail, notes, task, etc.) across folders in Outlook. Suspected doublets are listed and can be moved to the folder for Deleted Items.
Once installed it can save you a lot of time by automatically detecting and removing duplicate e-mail messages, contacts or other Outlook items.