Topic Last Modified: 2005-11-18

The Microsoft® Exchange Server Analyzer Tool reads the following registry entry to determine the version of the Microsoft Windows® operating system that is running on the Exchange server:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion

A CurrentVersion value of 4.0 indicates the computer is running Microsoft Windows NT® Server 4.0. A value of 5.0 indicates the computer is running Microsoft Windows 2000 Server. A value of 5.2 indicates the computer is running Microsoft Windows Server™ 2003.

The Exchange Server Analyzer also queries the Win32_OperatingSystem Windows Management Instrumentation (WMI) class to determine the value of the ServicePackMajorVersion key.

Finally, the Exchange Server Analyzer queries the Win32_Service WMI class to determine whether the ClusSvc service is started.

The Exchange Server Analyzer displays a best practice configuration message if the following conditions exist:

It is recommended that you evaluate the updates and hotfixes that are available and determine whether they might resolve problems in your environment.

For more information and for the list of updates that are available for servers running Windows 2000 Server, see the Microsoft Knowledge Base article 895090, "Recommended hotfixes for Windows 2000 Service Pack 4-based server clusters" (