Here is another way available at
http://recoveryexchangeserver.blogspot.in/ to recovers corrupt or inaccessible edb files from exchange server database and converts them to as your choice like pst, eml, msg. This tool allows to export email messages html, rtf and text files. It completely supports migration of selected or entire mailboxes to the cloud with OWA(outlook web access) or office 365 mailboxes.