The best and most reliable software is OST to EML Converter, which Saves OST files in EML format. It is the most reliable approach for users to save multiple OST files in EML format. The tool is fully capable of converting OST files of all sizes. OST to EML Software has so simple GUI which can be easily handled by any non-technical user and transfer multiple OST files to EML format without any technical glitches. Refer: https://www.softaken.com/ost-to-eml-converter