There's a plenty of them now because this problem with changing email formats for Outlook is really widespread. You can install the one on your device or use one of the online ones, depends on what type is more convenient for you.The good converter works fast and can convert the formats of many messages at the same time. Also, it's important to choose the safe one because some converters can steal your personal data. For example, web developers recommend in this case Outlook Transfer, Email Migration Service convertemail.online/ , Outlook Import Apps and Outlook Converter Software.
For a more convenient way to connect to databases and cloud applications, as well as to extract data from heterogeneous data sources, I advise you to use the Salesforce odbc driver www.devart.com/odbc/salesforce/ with it, you can connect to Salesforce data via HTTPS or connect through a proxy server