To export EML file to PST format many third party Tool available on the internet market, so I want to suggest you to an effective utility EML to PST Converter to Export Email, Calendar, tasks, and other items to Outlook PST. The tool maintains the internal structure of the file in the conversion process. you can download demo version without paying. Get more information:-
http://www.download.adwages.com/eml-to-pst-conversion/