Microsoft 365 includes Skype for Business, which lets you have instant messaging (IM), audio and video conversations, and Skype for Business Meetings. To download Skype for Business, sign in to Office 365, then at the top of the page, click Settings 
With Skype for Business you can:
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See when people are available, away from their desk, or in a meeting
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Send an instant message
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Set up and join a Skype for Business Meeting
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Share your desktop or a program in a Skype for Business Meeting
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Make and receive audio and video calls
