If you want an easy way to delete duplicate MSG files quickly while maintaining the email data and attachments, I suggest SomeTools Remove MSG Duplicate. This application will scan for duplicate MSG files and delete them without losing anything. There’s no need to have Microsoft Outlook installed. It will work with all versions of Windows OS, including Windows 7,8, 8.1, 10, and 11. So, it should work fine for a non-technical user. It looks about as safe as I have seen, and he should have no problem removing the duplicate MSG files. He will search the file throughout the entire Outlook MSG file, and does not have to worry about losing anything.