Summary: Learn to use the Lync module for Windows PowerShell to extend the Active Directory schema.

Hey, Scripting Guy! Question Is there an easy way to use Windows PowerShell to install a new Lync server?

Hey, Scripting Guy! Answer After you have the Lync core installed on the server (even if you haven't installed Lync itself),
          you can use the Windows PowerShell cmdlets!

To extend the forest:

Enable-CSAdForest

To extend the domain:

Enable-CSAdDomain