I believe you should use SysInspire OST to PST Converter software because it includes a very useful feature that allows you to convert Outlook OST files safely and securely. This tool also provides technical support to help you with any questions you may have. It can convert Outlook OST files to PST as well as HTML, Zimbra, Office 365, Gmail, Yahoo, MBOX, MSG, ICS, vCard, EML, and EMLX. It only produces unique results. Download the free demo version of this tool from SysInspire's official website.
Read More:- Convert OST File to PST