If you are unable to open OST file directly in Microsoft Outlook, then eSoftTools OST to PST Converter Software is an easy and effective solution. It is not possible to directly open an orphaned or inaccessible OST file in Outlook, so it has to be converted to PST format first. This software scans the OST file and shows a preview of all emails, contacts, calendars and attachments and then gives the option to export them to PST. After conversion, you can easily import the PST file into Outlook and access all your data without any data loss.

Read More:- Open an OST file to Outlook