Outlook does not allow to export emails in normal way. You may use the application called Data Extraction Kit to export emails and other Outlook objects to EML and MSG files with file name equal to their Subject line. If you are a regular user of Outlook, I advise you to look at this site. https://incredimail.tooutlook.com/ There you can find answers to such questions, read useful articles and communicate on the forum with other users of Outlook.