For a quick and reliable solution, I would like to suggest the MailsDaddy Exchange SEver suite. This GUI application runs on all Windows OS and allows users to
transfer Exchange mailbox into PST, Office 365, Live Exchange, EML, and various other file formats.
The application keeps all mail items in a new PST file and transfers the Exchange database to the desired mail format without any technical hassle. The application supports all Windows OS and easily repair corrupted, damaged, and unmounted mailbox at once.