Now many of us are using Windows 8 and Windows Server 2012. In many cases, there are some problems updating these operating systems with WSUS 3.0. The first symptom is, that these systems are reported in WSUS as Windows XP pro, not as Windows 8. It seems that the problem is in WSUS service. To solve the problem you must install WSUS SP2, which is downloadable from http://www.microsoft.com/en-za/download/details.aspx?id=30747 (64bit) or from http://www.microsoft.com/en-za/download/details.aspx?id=30748 (32bit).
After installing this update, you will be able to update the Windows 8 and Server 2012 operating systems..