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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right click on my computer go to manage and go to user account and groups
you should see one called rdp or remote desktop or termianl services. Add the users to this group and they will be able to connect