Microsoft has released two security guides for Windows XP and Windows Server 2003
Windows XP Security Guide
The Microsoft Windows XP Security Guide provides several levels of security guidance for customers interested in hardening deployments of Windows XP for desktop and laptop clients in their environment.
XP Security Guide
Windows Server 2003 Security Guide
The Windows Server 2003 Security Guide provides guidance to assist in hardening Domain Controllers, Infrastructure servers, File servers, Print servers, IIS servers, IAS servers.Certificate Services, and bastion hosts.
WinServer 2003 security guide Source: NT-Compatible
Windows XP Security Guide
The Microsoft Windows XP Security Guide provides several levels of security guidance for customers interested in hardening deployments of Windows XP for desktop and laptop clients in their environment.
XP Security Guide
Windows Server 2003 Security Guide
The Windows Server 2003 Security Guide provides guidance to assist in hardening Domain Controllers, Infrastructure servers, File servers, Print servers, IIS servers, IAS servers.Certificate Services, and bastion hosts.
WinServer 2003 security guide Source: NT-Compatible