OneNote Class Notebook is a great tool to promote student collaboration with the "Collaboration Space." Teachers can share notebooks and collaborate too!
Class Messenger is the only service available that enables a greater connectivity between teachers and parents, without asking for more time from either. In fact, the easy-to-use and versatile communication tools can actually reduce teacher workloads. And they keep more parents involved by requiring only the time it takes to glance at a phone or click a mouse.