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If you want to convert OST files into multiple file formats without any file corruption, then I recommend you DRS OST to PST Converter. It gives you all advanced features that are helpful to completer the conversion of OST files. You can migrate your OST files to AOL, Gmail, Yahoo Mail, Office 365, Thunderbird, and Opera Mail. It allows adding multiple files at a one-time conversion. The GUI is simple for users to complete file conversion.