Office 365 is constantly evolving and Microsoft is consolidating product specific API sets to one Office 365 API. One of the major products in Office 365 is SharePoint Online which has the Client Side Object Model (CSOM) for remote access into SharePoint. With two API sets targeting the same platform guidance is required. This session covers a short overview, but quickly takes a deep dive into the Office 365 API for SharePoint Site services. Topics covered are authentication, discovery, CSOM and REST. Demos supporting the topics show examples of file and list operations. By combining both API sets you get the best of both worlds and opens up new possibilities. Joining this session enables you as a developer or architect to choose the best solution approach to your customer requirements.