Jeff Jones released his security report about the Security Vulnerabilities found in Windows Vista during the first 6 months. His analysis shows that Windows Vista has less High severity vulnerabilities in the first 6 months compared to Windows XP and other Operating Systems.
Check out the complete report at http://www.csoonline.com/
Is this one still making the rounds? It's so full of misjudgements and poor research that it can hardly be called a report.