Use SysInspire OST to PST Converter tool to transfer data from Exchange to PST Outlook, make your Exchange account emails, calendar, contacts and other items accessible through Outlook.
Import from OST to PST file can be done automatically and can be backed up in the PST format. Software can supports all versions of Exchange and Outlook.
Free download the software and get some of files from each and every folder.
More info:- OST to PST Converter Free tool