I would highly recommend this Outlook Duplicate Remover which is helpful and useful software to remove all the duplicate emails from mailboxes and optimize the performance of MS Outlook. This application also eliminates the .pst files from the folders with multiple duplicate Outlook PST files. They can also view the .pst files with its attributes including the file name, file path, the number of duplicates found, their name, and the status of files. A status report is also generated by the program with the current status of each file and the completion status is displayed as the number of items proceeds.