Start using Lync for IM and online meetings - Microsoft Support
https://support.microsoft.com/en-us/office/start-using-lync-for-im-and-online-meetings-36d2a337-e835-4ae6-b821-44cb6907b17f
WEBStart using Lync for IM and online meetings. 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 > Office 365 settings > Software > Lync.
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