How to convert OLM data files to CSV files? If you are also having such a query, then download OLM data files to CSV Converter. It’s a simple to use tool that is useful for all user types and also supports batch option for migrating unlimited OLM data files to CSV format. You can also check your OLM files using its preview option and move only required OLM data items by utilizing various advance filter. Free demo of the tool is available for all Windows OS and allows you to understand how to export OLM data files to CSV, but it is restricted to first 25 data items per OLM folder only.