If you have been configuring Kerberos, you are aware of setting up delegation on computer and service accounts. I recently tried to configure this on a Windows 2008 Domain Controller and was confused as to why the delegation tab was missing. I went through the usual checking of the Domain Functional Level to ensure it was set to at least Windows 2003, but was still unable to see the delegation tab for my service account. I was however, able to access the tab for a computer account. After further investigation, I discovered that the delegation tab will not appear until the account has a servicePrincipalName or SPN. Once I added the appropriate SPN to the account, the delegation tab was accessible.

Paul Buckle over at xtravirt has created a very useful batch file for downloading all the VMware documentation. This makes a really handy offline reference library especially if you need the information at the speed of fast. You will need to register in order to download this, but it is worth the registration. Thanks Paul. You can find the download link here