Microsoft has made new Visio stencils available for Exchange 2013, Lync Server 2013, and SharePoint Server 2013. Download links are below:
This stencil contains more than 300 icons to help you create visual representations of Microsoft Office or Microsoft Office 365 deployments including Microsoft Exchange Server 2013, Microsoft Lync Server 2013, and Microsoft SharePoint Server 2013. Download here.
This stencil contains Exchange 2013 specific icons to help you create visual representations of Microsoft Exchange 2013 deployments, including on-premises, hybrid, and Office 365. Download here.