Microsoft has released a new set of Visio stencils and shapes for Lync 2013 and Exchange 2013. You can download the new stencils here.
This stencil contains more than 300 icons to help you create visual representations of your Microsoft Office and Exchange Server architecture.
The Visio stencil provides more than 300 icons — many depicting servers, applications, and services — that you can use in architecture diagrams, charts, and posters. These icons are primarily centered around Lync, SharePoint, and Exchange technologies and features.