Powerpoint presentations spreadsheets, paperwork, meetings that are purely analog. Reading, writing, annotating. Natural interface, no barriers between users, devices. XML is the base protocol for the new era of software. As big a transition as from DOS to Windows.
Storage is out in the cloud.
The cloud understands, it's richer, it indexes things, it's based on database technology, it's the XML store. Think about the Windows clipboard. And OLE, that's when Windows really started to become object oriented. You no longer leave the browser, that's the Universal Canvas. These are their toolkits.