While Microsoft Outlook stores your Outlook profile information in its Outlook data files - formatted as PST files - additional profile data exists in the. Remove all traces of your personal email accounts by deleting hidden files and registry keys from your hard drive. outlook 365 delete key deletes email instead of text, How to Delete an Outlook Profile Registry.In this situation, you can undo deleting by the Recover Deleted items feature in Outlook. If you have deleted the email permanently by pressing Shift + Delete keys simultaneously, or deleted it from the Delete Items folder again, you will not find out the specified deleted email in the Deleted Items folder any more.