Creating a self signed SAN Cert

Hi all,

I am wanting to create a self signed SAN cert. I am using the MMC snap-in to add the Certificates snap-in to create a custom request. However on the Private Key type, I don't see the option to select Key Type is Exchange.

This is the article I am following: http://blogs.msdn.com/b/andrekl/archive/2008/09/24/how-to-generate-a-csr-for-an-iis-website-using-the-windows-vista-server-2008-certificates-mmc-plugin.aspx

Anybody know why?