Behaviour of different guest OS's with respect to Integration Services

I am migrating a bunch of physical machines to be hosted on Hyper-V Server 2008 R2. The guest operating systems are a variety of Windows versions. For reasons I won't detail, I need to know which versions of Windows will automatically install a virtual NIC when they are first started as a virtual machine, and which versions of Windows will not have a virtual NIC until I log in to the VM and install Integration Services.

For example, I have already determined that Windows Server 2008 R2 and Windows SBS 2011 automatically install a virtual NIC without requiring an initial login, whereas Windows Server 2003 SP2 does not. What is the exact dividing line or criterion for predicting this behaviour on other versions of Windows? (I need to predict for both desktop and server versions of Windows).

Thanks,
Richard Koett.