When you add a network adapter to the host computer (including a Loopback adapter) the new adapter won't appear as an option on the Network Properties page for any virtual network, so you won't be able to connect a virtual network to it. To fix this problem, you need to enable the Virtual Machine Network Services driver on the adapter, as follows:
The network adapter should now appear in the "Network adapter on physical computer" list on the Network Properties page of any virtual network.
You can follow this procedure any time Virtual Server doesn’t recognize a network adapter. This is a rare occurance, but if there's already a virtual network configured on this network adapter, you'll have to remove from the virtual network any virtual machines that are using it and then re-connect them. Otherwise the virtual machines won’t have network connectivity. You do this as follows:
I just head from MS Product support that adapter teaming is not supported. Is this true?
Chad, handling fault tolerance or load balancing is done on the host operating system. On the host, you can use teamed NICs in either fault tolerance or load balanced modes, but guests will see the teamed NIC as a single DEC 10/100 chipset adapter. Media speed will be identical to the speed of the physical adapter.