clipped from osnews.com

"The principal reason given for the tremendous under-the-hood changes to Windows unveiled early this year in Vista was the need to overhaul the security model. Indeed, Vista has proven to be a generally more secure operating system, though some vulnerabilities that apply to ordinary software impact Vista users just as much as any other. But now, software analysts testing the latest build 3205 of the beta for Windows XP Service Pack 3 are discovering a wealth of genuinely new features - not just patches and security updates (although there are literally over a thousand of those), but services that could substantially improve system security without overhauling the kernel like in Vista."