The best way to convert OST files to PDF is by using a reliable and professional OST Converter for Mac & Windows software. This software is developed with advanced features that allow bulk migration of OST files without any data loss. Its simple interface makes it easy to use by both technical and non-technical users. It was compatible with both Mac OS and Windows OS. It supports various file formats such as OST to PST, PDF, MBOX, EML, MSG, DOC, RTF, Office 365, Gmail, and many more. It was compatible with all MS Outlook 2021, 2019, 2016, etc.