Corey Roth gave a presentation on developing apps for SharePoint Online. He began by introducing himself and providing his contact information. He then discussed the types of customizations that are possible, including browser-based, SharePoint Designer, sandboxed solutions, and the app model. Roth focused on the SharePoint 2013 app model, explaining the different hosting options of SharePoint hosted, provider hosted, and auto-hosted apps. He demonstrated creating apps using the JavaScript object model and REST APIs.