When someone is searching for a free solution for Lotus Notes migration in Outlook, then it is suggested to export .nsf file in .csv and too manually. But as it has many limitations, hence one should try a tool like SysInspire free NSF to PST Converter software. This tool can assure complete conversion without distorting the file arrangement. Also, the user can recover deleted emails, without any data loss. Each email can be retrieved and saved with all involved attributes like, too, from, date, email, attachments, images, etc. The integrity of the database remains as the original one. A free demo version is also offered to all users with support to all editions of IBM Lotus Notes. Outlook installation is not important to get the desired results with this tool.
More info:- NSF to PST conversion
Manual Method to Convert NSF Files into PST Files
Launch IBM Lotus Notes program.Click File > Open > Louts Notes Application.In the Open Application window, browse for the required NSF file and click Open.
click Export.On Export dialogue box, enter the file name, file location, and saving type.
I hope this will help