Collaboration solutions are the hot software vertical right now and the industry keeps rolling out new and improved offerings with no signs of slowing down.
Microsoft, for example, has started rolling out its Slack competitor Teams to Office 365 users globally. The Teams service, which was announced in the later half of 2016, is a chat and collaboration app with very tight integration with Office. Microsoft is introducing some new features as well as the product enters into general availability.
Teams now offers audio calls from mobile device and video calling on Android (iOS and Windows phone are reportedly coming soon). Team users can also email an entire channel, send message using markdown formatting, and receive summary notifications about all posts within a channel.
Slack has long been the leader in this particular software vertical and that is, in great part, thanks to it being platform agnostic (not tied exclusively to Office, Google Docs, etc.). Microsoft is well aware of this, of course, and is actually opening up integration opportunities to make it happen.