If you want to import NSF to Office 365, I advise you to get the SysInspire NSF to PST converter tool. This is one of the best tool that can help users to convert NSF file into multiple file formats such as NSF to PST, EML, EMLX, Office 365, Zimbra, tgz, MBOX, etc. It has 13+ file formats for conversion. This tool has a feature of naming convention users can convert their mails by using subject+date, subject + from. Etc. It has a feature of email filtration: users can convert mails by using a specified date. It has a demo version that can help users to convert 25 items from each folder. It can support all versions of Windows OS. this tool can support all versions of Lotus Notes. It has technical support users can get help by mail or live chat.