Microsoft 365 includes Lync , which lets you have instant messaging (IM), audio and video conversations, and Lync Meetings. To download Lync, sign in to Microsoft 365, then at the top of the page, click Settings 
With Lync 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 a Lync Meeting
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Share your desktop or a program in a Lync Meeting
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Make and receive audio and video calls
