ATS OST to Office 365 migration recovers all permanently delete email from orphan OST file in PST, EMLX, MSG, vCal, vCard, EML, MBOX etc. along with email, contact, inbox, delete-item, sent-item, draft, outbox, task and attachment. There will be no changes in the internal series of OST folder or file after repairing. You will be able to split your PST file as per the size you require from the OST file and then divide and save into small PST file. It is easy to use. After repairing OST file you can save this into cloud-based application Office 365 & live Exchange server which is an additional feature.
OST File Exporter that able to recover Corrupted OST mailboxes and Errors and allows to export OST file to PST. You can also use this OST File Exporter but using one condition you convert only 10 OST emails to working MS outlook PST, EML, MSG, HTML, MBOX, MHTML, etc.
For more: http://www.ostfileexporter.com