It is possible to convert OST to PST file with the help of OST to PST converter tool.
This is the best software to convert corrupted data into Outlook PST file format. It can easily extract and export mailbox data such as emails, draft, tasks, notes, etc. to Outlook format without data loss. It supports to all edition of Outlook. A smart preview panel is visible to the user before the conversion of OST file. you can also download the demo version of this software which exports few items from each folder. Read More:-https://www.trustvare.com/ost/