TechNet Virtual Lab: Antigen
TechNet virtual labs are now available for Antigen, Microsoft's latest security acquisition. The brand was recently released and updated to version 9.0 as part of the Microsoft ForeFront umbrella. There is also a beta version available for Exchange 2007 server. I found the lab to be well constructed, hitting all the needed areas for a good understanding of how Antigen can be configured in an Exchange environment. Highly recommended if you have a spare hour to learn more about this product. And if you plan on deploying or evaluating Antigen in your environment then this lab is a must for learning a lot in a little bit of time!
Link to TechNet Virtual Lab: Antigen