The new update to Lync is available today and only for Windows 8.1
Take control of shared screens or apps
Run Lync side-by-side with another app at any window size
Answer audio and video calls quickly when your device is locked, without having to unlock it.
Mute and Control Call Volume from inside Lync
This update includes a number of improvements to the sign in experience so that you can more easily connect and stay connected.
How To Download:
To download the update, you need to first upgrade your device to Windows 8.1. Once you have Windows 8.1, Lync will upgrade automatically within 24 hours unless you have turned off Automatically update my apps in Windows Store. To get the update sooner,
search for Lync and click Install.