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This 5 minute video shows you how to remove duplicates from Customer Data in Excel 2010 using a Customer ID number as the basis for duplicate removal. It uses two techniques - the first the 'Remove Duplicates' button in Excel 2010 and the second using a formula which allows you to see the duplicates individually before removing them. The formula used in the video is: =IF(A2=A3,"Duplicate",). Brought to you by Tonica Marketing Insight, www.tonica.co.uk.