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Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.
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Replication may be slow - you can force it through the AD Sites and Services console:
http://technet.microsoft.com/en-us/library/cc816926(v=ws.10).aspx