How does one big fat NPS post sound? Good? I agree. Here goes.
Network Policy Server (NPS) is available on Windows Server 2008 and R2. NPS replaces IAS (Internet Authentication Service) as Microsoft's implementation of RADIUS.
NPS is available on Windows Server 2008 Standard and Enterprise editions. Standard edition supports a maximum of 50 RADIUS clients. Enterprise edition supports an unlimited number of clients and clients can be specified using an IP address range. Remember, RADIUS clients are actually servers, routers, access points etc, not client computers.
More to follow...