You want to convert Lotus Notes NSF to Outlook PST, so install the eSoftTools NSF to PST converter software where you can convert OST to PST and other formats like MBOX, EML, MSG, ICS, Yahoo Mail, Gmail, Office 365, vCard, EMLX, and a lot of formats in one simple click on mouse. It has a splitting option where users can split a large PST file into multiple small size PST files. eSoftTools teams available for you to give software related solutions 24/7 through email and chats.