Try the eSoftTools OST to PST Converter tool, which will transform all Exchange mailbox attachments such as addresses, contacts, schedules, papers, sent items, deleted items, and more into a PST file without downloading MS Outlook. You can use the free version to try out all of the functionality of this OST to PST Conversion Tool by exporting the first 25 objects per mailbox or folder.
Read more:- Export OST to PST files
Read more:- Export OST to PST files