The best way to take backup of Lotus Notes emails best approach is you can go with eSoftTools NSF to PST converter software. This software migrates from Lotus Notes to Outlook PST very quickly in an easy way. This tool has a demo version in which users are allowed to convert 25 items from each folder of an NSF file for free. It has technical support and all users get help by email or live chat. This tool has PST splitting users can split PST files into multiple small sizes after conversion of the NSF file.