Skype for business Server 2015 prerequisites on Windows 2012 R2

This article is based on the official documentation found here:
Install Skype for Business Server 2015 and here Install prerequisites

To install Skype for business Server 2015 make sure to use Windows 2012 R2 (Windows Server 2008 R2 reached the end of mainstream support in January 2015.)

First of all, run Windows Update.

Second, open a PowerShell command window as Administrator and run the following command:

Add-WindowsFeature NET-Framework-Core, RSAT-ADDS, Windows-Identity-Foundation, Web-Server, Web-Static-Content, Web-Default-Doc, Web-Http-Errors, Web-Dir-Browsing, Web-Asp-Net, Web-Net-Ext, Web-ISAPI-Ext, Web-ISAPI-Filter, Web-Http-Logging, Web-Log-Libraries, Web-Request-Monitor, Web-Http-Tracing, Web-Basic-Auth, Web-Windows-Auth, Web-Client-Auth, Web-Filtering, Web-Stat-Compression, Web-Dyn-Compression, NET-WCF-HTTP-Activation45, Web-Asp-Net45, Web-Mgmt-Tools, Web-Scripting-Tools, Web-Mgmt-Compat, Server-Media-Foundation, BITS

Or if you rather use the GUI check the following boxes in the Server Manager.

And the following boxes to configure the Web Server part.

Next, download and install the following patch (not included in Windows Update as of today) IIS crashes occasionally when a request is sent to a default document in Windows Server 2012 R2  This requirement is documented on this page: Server requirements for Skype for Business Server 2015 If you forget this requirement the deployment wizard will stop and alert you half-way through the installation process, like this:

If this happens you can safely download and install the patch and restart the deployment wizard.

Finally as you open the Skype for business Server 2015 Control Panel, it will prompt you to download and install Silverlight.

Happy Skyping!