Networking help

[2mike]

What is the differences between a network that uses Windows 7 machines in a workgroup and a network that user Windows 2008 Server as a domain controller with active directory and Windows 7 clients

[D3xus]

They're technically the same OS. But Server 2008 is modified for better control over large groups of user accounts as well as network controls.
Windows 7 is a standard Windows OS.