The issue focused on Microsoft Windows Server 2003 servers running Windows Server 2003 SP2 or Windows Server 2003 SP3 and supported machines running Windows XP Professional Service Pack 3 or Windows Server 2003 SP4. Microsoft issued Windows Update updates for Windows Server 2003 SP3 and Windows Server 2003 SP4 servers only on computers running Windows XP Professional Service Pack 3 or Windows Server 2003 SP4 running Windows Server 2003 SP3 or Windows Server 2003 SP4 running Windows Server 2003 SP4 using Microsoft Update on computers running Windows XP Professional Service Pack 3 or