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.
If you're looking to migrate emails from HCL Lotus Notes to Microsoft Outlook, the best tool to use is Shoviv LotusNotesto Outlook Converter. This utility is widely recognized for its reliability, supporting batch conversion of NSF files to PST while preserving folder hierarchy, email properties, attachments and calendar items. It also supports multiple Outlook and Notes versions, simplifying transitions for both end-users and IT teams. Therefore, for a smooth, secure, and well-supported migration from Lotus Notes to Outlook, this tool stands out as a strong choice.