My server has 2 gigabit adapters. And I am running two virtual servers (one for SBS domain controller and the other is our in-house web server). I had to re-install the OS for the hyper V server, so lost a few settings.
I went to install Hyper V and it said something about Virtual Networks. Anyway I ticked both LAN adapters because I didn't need remote management of this server. My theory was that it was more important for me to make either adapter available to the virtual servers (considering that my staff might accidentally plug the LAN into either adapter).
So now on the Hyper V Server I have 4 LAN Adapters.
* Local Area Connection (unplugged)
* Local Area Connection 2 (Enabled)
* Local Area Connection 4 (Unidentified network) Local Area Connection Virtual Network
* Local Area Connection 5 (Unidentified network) Local Area Connection 2 Virtual Network