Go to the File menu and then click on Info button.Methods to Remove all Duplicates Email from Mail Folder in Outlook 2016, 20 Method 1: Checking duplicate account
If your Inbox Update frequency is set to a very short time interval then duplication of emails will appear.If it’s one of the settings “Leave Messages on the servers” is turned on then there can be an onset of duplicate emails Outlook’s “Account Setting” can cause duplicate emails.Rules are configured incorrectly leading to duplication of emails.Due to synchronization in different devices, duplicate emails arise.Method 5: Using Aryson Outlook Duplicate Remover.Method 4: Set the timing of Inbox Update frequency.Methods to Remove all Duplicates Email from Mail Folder in Outlook 2016, 20.Right-click the duplicate folder, and then select Delete Folder.In MFCMAPI, switch back to the duplicate folder, which is now empty.
Click to enable the MESSAGE_MOVE checkbox, then click OK.Click on the Actions menu, then click the Paste Messages command.Close the folder window, then double-click on the original folder, which has the older creation date and time.