Do you want to reduce Lotus Notes' Mailbox size? Here, I recommend SysInspire NSF to PST converter Software as one of the best tools. With the help of this tool, you may convert NSF files into a variety of file types, including PST, EML, EMLX, Office 365, Yahoo Mail, Gmail, Zimbra-tgz, MSG, and MBOX. All users can contact technical assistance through email or live chat. It offers a trial version that is free and transforms 25 items from each NSF folder. It works with every Windows OS version. All emails that contain attachments like calendars, contacts, etc. are imported.