The MacSonik OST Viewer is an amazing software that offers various innovative features to ease the user process. You can open PST files with the help of this tool, and you can also convert OST files into various file formats, such as MSG, EML, and CSV, etc. Additionally, this versatile utility enables users to access orphaned OST files. This software provides a reliable preview feature, which means it allows users to view the entire OST file content, including the email message, subject, date, and attachments. After previewing it, you can convert the required OST files or choose to exclude duplicates.