Note for Windows Server 2003 users: This version of Common Licensing requires the latest service pack of Windows 2003 Server, and also requires the hotfix described in this article: http://support.microsoft.com/kb/938397. The symptom of this problem is no licenses found and an error similar to "This version of licensing is out of date or invalid. Please install the latest version." The License Manager may also report Error 601. The Microsoft Hotfix is specific to Windows Server 2003.