Many other third-party tools are available in the web market, but only a few are reliable. Here I am introducing one such tool I have used earlier, MacSonik EMLX Converter. The software is capable of removing duplicate emails while the migration is going on. It gives you an amazing Date-filtering feature that helps users migrate EMLX files from a specific date range. The tool is easy to use because of its simple user interface. It does not require any technical expertise to run this tool.