I'm working through a bit of learning on integrating MOSS with ADFS for a federated SSO scenario at a customer. There are some excellent resources available for learning this, which I'm using:

• Step-by-Step Guide for Active Directory Federation Services
• Configuring Multiple Authentication Providers for SharePoint 2007
• Installing MOSS as a claims aware application in ADFS

The step-by-step guide is very thorough, and easy to follow. The one glitch I ran into: when it came time to install the Federation Service on my account & resource machines, I couldn't. The Federation Service wasn't listed as an installable feature of ADFS - the only piece showing was the ADFS Web Agents.

Turns out the problem was in my VMs. I had started with a base VM running Windows Server 2003 R2 with SP2, Standard Edition. The guide was very clear in the requirement for the account and resource computers to run the Enterprise Edition of Server 2003 R2. So, what I did was to run the install of the Enterprise Edition and upgrade my base install. Should work, right? Well, it didn't.

Only when I wiped the two machines completely and installed the Enterprise Edition as fresh installs did the Federation Service and Federation Service Proxy options show up. I thought I'd pass that on for anyone who may run into the issue.