content: How can I convert ost file to PST? You can use Kernel for OST to PST Conversion tool to perform migration task. The tool swiftly convert OST file and its associated data items to PST and many other platforms such as MBOX, DBX, TXT, HTML, PDF, and EML. You can download its trial version to evaluate its working functionality before going to purchase it. Download trial version here: http://www.opensource.ost2pstexe.net