I am using Lync 2010, and need to mute/unmute my microphone frequently during the conversation. Searching on the web, I found that the the global shortcut Win-F4 should do this, but it seems having no any effect. Other keyboard shortcuts seem working on Lync, and Lync can be muted-unmuted by clicking with the mouse on the mute button in GUI (too slow as the mouse pointer must be moved to that button first).
In case Lync 2010 does not support muting by the Win-F4 shortcut, please provide possible alternative solution for muting the microphone through the keyboard.