@softaken_mbox_to_nsf
Using Softaken MBOX to NSF Converter is the most effective method for converting a large number of MBOX files to NSF files while preserving all of the data. Additionally, it is compatible with any version of the Windows operating system and Lotus Notes.
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https://www.softaken.com/mbox-to-nsf-converter
https://apps.microsoft.com/detail/xpdngjvn41kp8x?hl=en-US&gl=US