To convert OST to PST, use a specialized conversion tool like CloudXena OST to PST Converter. This tool allows you to convert OST files to PST and Other file formats such as PDF, MBOX, EML, EMLX, CSV, MSG, GIF, JPG, TIFF, HTML, MHTML, etc. You can also export emails to more than 10 webmail services like Outlook, Gmail, Yahoo, and Office 365. You can also remove duplicate emails during the process. A free version is available, which allows you to convert up to 50 emails per folder to try it out.

To Know More: https://www.cloudxena.com/converter/ost-pst/