Today we refreshed the Forefront TMG Beta documentation. As a rule, always look on Technet for the most up-to-date documentation.
If you're working with the e-mail protection feature, we recommend the topics Installing prerequisites for e-mail protection and the new procedural topics in Configuring protection from e-mail-based threats.
We're always interested in hearing your comments about the documentation. Send your feedback to firstname.lastname@example.org.
Content Publishing Manager
Forefront Threat Management Gateway