Use this One of the best OST to PST Converter which is designed with advanced algorithm which actually helps to recover the damaged OST files and convert into PST files. It can save the result into EML, EMLX, vCard, vCal, MSG, and MBOX. And the best thing is that you can directly migrate your OST database into the cloud based applications like Office 365 & Live Exchange Server. this tools has ability to convert multiple mailboxes with emails,inbox,sent items,drafts,contacts,calendars,notes and complete metadata properties such as to,cc,bcc,subject,date and time. It can easily recover inaccessible data from corrupt OST file and restore them into new Outlook PST file. When the scan process is done then this tool shows you the preview of data before conversion. it provide free trial version which allow the users to see the preview of recoverable data before conversion.