If you have been using the Windows Live Mail application, you would have come across the Unknown Error message on the screen. The error is not too severe to be worried about, to be honest. It is bound to occur when you are trying to delete or move the email conversations. Since the size of the conversation might be large, it might cause the application to malfunction and throw the Unknown Error on the screen. The issue occurs typically because of the failed email syncing procedure. So, when you are trying to delete the conversation, the Windows Live Mail will think that the email conversation you want to delete doesn’t exist. You don’t have to panic for this Windows live mail an unknown error has occurred as the process to resolve it is quite simple.
Let me help you through the steps to make sure the Unknown Error does not occur again.