Microsoft sees competition coming in from the likes of HipChat and Slack—newer online services that want in on the company's action. Business communications? That's Microsoft's thing. That's what Outlook is for!

Today Microsoft has released Outlook Groups for mobile devices, coinciding with the launch of Office 2016. The app lets you participate in group email conversations, @mention people in the group, share photos, collaborate using OneNote, and view Office documents.

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Outlook Groups is free to download, but as you might expect, it requires an Office 365 subscription.