Post was helpful!

Thanks :-)

I'm using windows 7 and it won't let me install the feature because ServerManagerCmd.exe was removed in w7 (see http://technet.microsoft.com/en-us/library/ee681714%28WS.10%29.aspx)
Do you know another opportunity to add feature without using the gui?

Hey Ronny, on Windows 7 you can accomplish this by using pkgmgr.exe. Just open an elevated command prompt and run the following:

pkgmgr.exe /iu:IIS-WindowsAuthentication

It won't provide any feedback, but should complete within a few seconds. You can open IIS and look for Windows Authentication under the Authentication feature to confirm.

pkgmgr.exe /iu:IIS-WindowsAuthentication
I ran the above on my command prompt yet Windows Authentication is still not listed under IIS. I use Windows 7 Home Premium

You can't have Windows Auth in IIS 7 on Windows 7 Home edition. See article below

http://technet.microsoft.com/en-us/library/cc754628(v=ws.10).aspx