What tools can help convert Thunderbird files into NSF format?
Several reliable tools can help in the efficient conversion of Thunderbird files to NSF format. Out of these, EmailSoftwares Thunderbird to NSF Converter is one of the most recommended, providing seamless and safe migration while retaining the email properties, folder hierarchy, attachments, and formatting. It performs batch conversion, allows email previews prior to migration, and offers data filtering for selective conversion. Fully compatible with Lotus Notes and the Windows operating system, it is an easy-to-use tool for both technical and non-technical users. The free trial version lets one scan and preview Thunderbird mailbox data before full conversion.
More Info: https://www.emailsoftwares.com/products/thunderbird/nsf/

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Alla crook commented
After trying numerous approaches, I discovered the WholeClear Thunderbird to NSF Converter to convert Thunderbird emails to NSF format for Lotus Notes. It's the simplest and most dependable solution when I need it. Though not particularly difficult, the software is easy to operate. I effectively moved my whole Thunderbird mailbox to NSF without any data loss simply a few clicks. It keeps email features including attachments, formatting, and folder organization.
The speed and accuracy of the conversion caught my attention most. Furthermore, it is the ability to examine emails before conversion. I strongly advise trying the Thunderbird Thunderbird to NSF converter if you want a hassle-free approach to transferring Thunderbird data to Lotus Notes.Read More - https://www.wholeclear.com/thunderbird/nsf/