For Converting NSF file to Office 365 Platform you can take help of this Regain NSF to Office 365 Migrator.
This Software easily Migrate your NSF file to Office 365 platform with its complete Meta Data such as Subject, To, Cc, Bcc, sent and receive date etc.
The software is capable to export several NSF files, including tasks, emails, calendars, to-do lists, and journals.
You can also try this Software free trial version.