Hi there. Correct, the Operating System column will show Windows 2003. For seeing the service pack, which I believe is what you\'re asking for, you want to look under the Service Pack column. You can see this column under the Primary tab, but it may be easy to find it under the Windows tab.
Windows 2003 R2 should be analogous to Service Pack 1. There is no other way we know of to distinguish. Of course Service Pack 2, just released, would be newer.
You can also look under the OS (WMI) column to determine the OS flavor, be it Standard Server, Advanced Server, etc.
To give a better explanation of these tabs; the Primary tab contains all fields from System, Windows and Network tabs. In other words, those 3 tabs split up the Primary tab into easier-to-find categories.