Use the vMail NSF to PST Converter application. All mailbox data items, including emails, calendars, contacts, journals, attachments, tasks, and so forth, are stored using this program in addition to other file formats, including PST, EML, EMLX, MSG, HTML, MHTML, MBOX, and so forth. Any size of Lotus Notes contacts can be imported into Outlook using this free software. The mailbox contacts can be accessed at any time and from any place. All NSF file contacts can be imported unchanged into Outlook PST files.
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https://www.vsoftware.org/nsf-to-pst-converter.html