The basic step is to download and install NSF to MBOX Converter on your system.
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Once the software starts, click on the Browse button and add NSF files.
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The added NSF file is being scanned by the software and then it fetches the complete information of NSF file.
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Select MBOX format in Export Type.
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Now, use the Browse button and choose an output directory to save MBOX files.
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To complete the conversion process, move the mouse pointer to the Convert Now button.
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(Note: Lotus Notes should be installed in the conversion machine to export NSF file to MBOX.)