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If a user with a username myname already exists then that user will be imported as imported_myname so that data is not overwritten.

When you go to the users wp-admin dashboard if you select to delete a user when you select the imported_myname to delete you will be prompted to attribute the content to another user, you can then select the myname user and everything will be sorted, hopefully 🙂

You’ll want to check and verify both before and after that the correct topics and replies are attributed to the correct users bother before and after doing the above.