If you need to convert your EML files to Outlook MSG, I recommend using this eSoftTools EML to PST Converter Software because it has worked for me in the past. This app transforms all email messages easily. This converter tool allows users to translate a large number of EML files into Outlook MSG format in just a few clicks, with no data loss. This tool works for all versions of MS Outlook, including versions like- 2019, 2016, 2013, 2010, 2007, 2003, etc.
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