The software which is perfect for restoring an OST file into PST Outlook is SysInspire OST to PST Converter tool. This is the recommended software for restoring OST files. This software can convert OST files into PST and also many other formats including CSV, VCF, EML, EMLX, Gmail, Office 365, IMAP Account, Zimbra Desktop, and many more. This software also gives technical support 24/7 to the user related to software. Free version of this software is also available. You can just check the link given below.