If you want to migrate Lotus Notes to Office 365 then the users can also go with Lotus Notes to Office 365 Software from Bitdataconversion. This software migrates Lotus Notes to Office 365 and also exports into Live Exchange Server, Outlook, EML, and MSG format. Shoviv Lotus Notes to Office 365 provides the free trial version
If you have been using Lotus Notes email client since a very long time then, definitely you are well aware of the fact that it saves their complete database in .nsf file format. It supports user to program and configures your machine as like the web server but, mostly acts as the mailing email application.