If you intend to deploy your URA with backward compatibility for Windows 7 clients, you must keep in mind that it complicates your setup somewhat. The hard part is not in the multisite wizard, but in the fact that multisite selection is not available for Windows 7 clients, and so this will require you to plan your security groups.
During the multisite wizard in URA, you will be specifically asked whether you wish to provide this service to Windows 7 clients. If all the other requirements are met, this will be rather simple. As you may recall from Chapter 2, Planning a Unified Remote Access Deployment and Chapter 3, Preparing a Group Policy and Certificate Infrastructure, Windows 7 clients cannot choose which entry point to connect-to, and so you'll have to make that decision for them. This is done via security groups in active directory. For Windows 8 clients, you need only one security group to contain all of them, but with Windows 7 clients, you'll need...