Start using Lync for IM and online meetings - Microsoft Support
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. With Lync you can:
Applies To:
Office for business, Office 365 Small Business, Lync 2013 for Office 365