End a Meeting
When the work is done you can end the Lync meeting. The Participants will be notified.

3. Try It: End a Meeting
The Lync meeting is still online.
Go to More Options->End Meeting.

What Do You See? The Online Meeting has an "Undo." There is a banner that shows you have left the call. You can click on Rejoin to go back to the conversation if you wish.

Keep going..

Memo to Self: If you just hang up the phone, you leave the Meeting. The other participants can keep on talking after you leave.

Lync->Online Meeting->More Options->End Meeting