You can use the SoftMails OST to PST Converter software for better results of OST files without any error. It can restore all data of OST file emails, documents, deleted files, tasks, notes, chats, contact, attachments, appointments, and many several items and convert the Outlook OST file into the PST format, HTML, Yahoo, Gmail, Office365, MBOX, EML, EMLX, etc. it will give you the email filtering option that can help you to maintain the all email properties such as to, bcc, cc, subject, time, date, data, from, subject, and also manage the all properties without any modifications.
Read More:- Convert the Outlook OST file into the PST Format