We get to work with the newest and coolest software all the time. One of the biggest selling point of Office 365 is the constant stream of new features and functionality. New builds of Exchange Online are pushed into Office 365 daily, therefore new features can show up at any time.
These constant updates do come at a cost. To date, the documentation for Office 365 has not kept up with the pace of change in the service. New features and functionality are often added into Office 365 with little to no documentation. This often means that we need to figure them out on our own.