The strength of Windows Vista’s security model is easily the biggest question facing the nascent operating system. The place of Vista in the enterprise is not yet clear. Microsoft must demonstrate that its approach to security with Vista is indeed effective. The report’s findings are mixed and at times a little unfair, but it does demonstrate the problems that Microsoft has to face. The jury is out on how well it did or did not do since the reviewers were unable to determine the full threat of the exploits they were using.”]
Source: https://arstechnica.com/information-technology/2007/05/windows-vista-no-more-secure-than-xp-report/