You can also use CubexSoft Outlook Converter Tool to convert Outlook PST file to Lotus Notes .nsf file format directly. It allows you to batch import Outlook PST file to NSF file format including all emails, contacts, calendars, etc. without Outlook. There is no file size limitation, one can export a large size of PST files into IBM Lotus Notes. This software also supports various file formats such as PDF, MBOX, EML, MSG, DOC, RTF, Office 365, Gmail, G Suite, Exchange Server, Thunderbird, etc. It was compatible with all the latest and below versions of MS Outlook, Windows OS, and Mac OS.