This is quite a bad news that Microsoft dropped File Services for Macintosh from Windows Server 2008.
You’ll have to persevere with SAMBA or look at 3rd party alternatives such as..
ExtremeZ-IP is the only Windows-based server software today that actively supports all Mac OS versions from OS 9 to OS X 10.5 (Leopard) and Windows Server 2008.
ADmitMac v4, supporting both Intel and Power PC Macintosh computers, allows users running Mac OS X 10.4 Tiger or Mac OS X 10.5 Leopard to participate in Microsoft networks taking advantage of all the directory services provided by Active Directory, NT, and Apple’s Workgroup Manager.
DirectControl offers the simplest and most full-featured Active Directory integration solution for Mac OS X. Because it relies on Active Directory’s Group Policy architecture, it functions more seamlessly for managing access … particularly for systems administrators who are unfamiliar with Mac OS X.
MacServerIP 9.0 is an advanced Apple file sharing system that replaces services for Macintosh (SFM) on Microsoft Windows servers and workstations. The new rock solid system solves many SMB and SFM networking as well as file sharing problems, reduces workflow bottlenecks, eases administration responsibilities, and allows PC based IT departments to better co-exist with Mac dominated graphics departments. MacServer IP is guaranteed to speed up and optimise file sharing between Windows Servers, MacOSX and MacOS9 clients.