This post is more about the confusion that may arise around SPNs for setting up Kerberos authentication in IIS 7.0. IIS 7.0 has a new
The are good post SharePoint Farm using Kerberos on IIS7 related to this configuration.
In Windows Server 2008, kernel mode authentication runs under the machine account, but Office Communications Server 2007 R2 runs under a user account. As a
This step-by-step article describes how to configure Microsoft Internet Information Services (IIS) to support both the Kerberos protocol and the NTLM protocol for network authentication.