Windows Server 2008 includes the Services for Network File System (Services for NFS) as a Role Service of the File Server role.
If your Active Directory is not at least at the Windows Server 2003 domain functional level, you must install Server for NFS Authentication on every domain controller in the domain, and on every domain controller of any domain whose accounts might need access to NFS resources on this domain.
To install Services for Network File System, follow these steps:
Open Server Manager.
If the File Server Role is not installed, click Roles in the Console Tree pane, and select Add Role from the Action menu. Include the Services for Network File System role service, as shown in Figure 27-2.
Figure 27-2. The Select Role ...