To convert OST files to PST, I recommend using MacSonik OST to PST Converter. It is a reliable tool to convert OST files into PST File Format without any hindrances. You can import OST files into multiple email clients like Gmail, Yahoo, Office 365, AOL, IMAP, Hotmail, Zoho, iCloud, and other email services. The tool consists of multiple advanced features like Perform Batch Conversion in which users can save multiple or bulk OST files in no downtime. Apart from this, the software is compatible with both Mac and Windows operating systems.