To import OST files to PST Format? Then I Will recommend you can also try ZOOK OST to PST Converter. It is the best solution that can import the files without losing a bit of information.
OST to Outlook Converter retains all the metadata and RTF formatting of the emails intact even after the conversion process. A FREE DEMO VERSION for the same is also available that avails the users to test the working efficiency of this tool.
I hope the shared information would be helpful for you. If you want to download a free demo version of OST to PST Converter so you can click this https://www.zooksoftware.com/ost-to-pst/