Only OST converter that can convert the data without any data loss then you should try the free demo version of
InQuit OST to PST Converter to convert the data without any data loss. It means your data will remain the same even after the conversion of the data. You can see the preview of the conversion before the actual conversion is done. You can also split the large-sized PST files into small bits as per your needs. You can convert your data into various formats like PST, EMLX, MSG, MBOX, vCal, vCard, EML, etc. Try the free demo version of the converter to convert 30 emails for free.
Read More Info: https://www.inquitsoftware.com/en/ost-to-pst-converter.html