oftware-as-a-Service (SaaS) can include SharePoint Online and Office 365
http://community.hpe.com/t5/Enterprise-Services/Software-as-a-Service-SaaS-can-include-SharePoint-Online-and/ba-p/6846450#.V4Tp-fl95D- https://blogs.technet.microsoft.com/wikininjas/2016/03/20/sharepoint-online-and-office-365-business-productivity/