Ive tested a couple of tools, and I can say eSoftTools NSF to PST Converter was the most reliable. It didnt just dump everything into PST; it actually gave me options to export selectively. For example, I only wanted Inbox and Sent Items, not all folders.
Some highlights I found useful:
Works with all Lotus Notes versions (even older NSF files).
Lets you convert emails, contacts, calendars, journals, and tasks.
PST files it creates are compatible with Outlook 2016, 2019, and Office 365.
Id say if you want something professional and safe without risking data corruption, eSoftTools is a solid choice.
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eSoftTools NSF to PST Converter Software - convert nsf to pst, eml,emlx,mbox,gmail and more.