You cannot view all the print servers in the Print Management console on a Windows Vista-based computer
When you view the print server information for the print servers in the Print Management console on a Windows Vista-based computer, you notice that all the print servers are not displayed in the Print Management console. You may also experience other issues that prevent you from viewing the complete information for a print server. For example, the print queue information may not be available.
Note: You may also experience this issue in the Print Management console that is running on a Windows Server 2003 R2-based or Windows XP Professional Edition-based computer.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB954377.