Go with the most popular eSoftTools OST to PST Converter Software to extract and recover contacts from OST file free. This is the most suggested or protected OST to PST Converter Software. It can also restore the lost data of OST files like contacts, emails, calendars, tasks, journals, notes, chats, attachments, appointments, and msg, etc. Before purchasing you can try a demo version of this tool from the official website of eSoftTools that converts 25 items from every folder of the OST mailbox.
About Know More: Extract and recover contacts from OST file free

Install the SysInspire OST to PST Converter tool and convert OST file to PST. It's a very helpful tool for all. Its algorithm work very smartly in all Windows OS and Lotus Notes Version such as. Its converts OST file to PST and many other file formats such as EML,HTML, Yahoo, Office 365, Yahoo, Gmail, Zimbra, EMLX, MBOX, ICS, CSV, and VCF. Check the official website and download the free demo version.
Read More:- Change OST File to PST