To get instant results, you can go for MSG to MBOX Converter software. The software allows users to export your MSG files without creating any changes to the content of the MSG file. Hope you will get the demanded results using this tool.
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There are lots of Mac users and they also want to migrate the data from MSG to MBOX but what about the solution the manual method is not so reliable and can damage your data files. You should try a different solution name as Mac MSG to MBOX Converter which is a true life saver for me and I personally used this software. I have download loaded this software from here:-