Hi @Michael Hendricks ,
Welcome to our forum!
As I know, only .pst, .ics and .csv file can be imported into Outlook and Lotus Notes Emails can't be imported directly into Outlook.
According to your description, I notice that you mentioned that the method of exporting the NSF file to .csv file first and then importing .csv file to Outlook didn't work for you, did you encounter a problem when importing and exporting files? If you have any problem when you import the .csv file into Outlook, please provide more information about the error for our further research.
If you have tried the method and no error occurred or you just don't like this method, I'm afraid you need to search for any 3-rd party tools to convert and import the file to Outlook.
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