Team communication: Teams need to interact in a variety of different ways: public groups/private groups, fixed groups/ad-hoc groups, groups/1-2-1. HipChat supports a variety of different ways of interacting, and does so in a way that's easy to use. People nowadays use a variety of different devices (and classes of device). HipChat has a range of native clients, plus a web based one, and so can be used on most of the devices that people want to use it on. (We use Slack, but I've tried and liked HipChat too)