Vista - Microsoft: Google Chrome Frame makes IE less secure.

The release of Google Chrome Frame, a new open source plugin that injects Chrome's renderer and JavaScript engine into Microsoft's browser, earlier this week had many web developers happily dancing long through the night. Finally, someone had found a way to get Internet Explorer users up to speed on the Web. Microsoft, on the other hand, is warning IE users that it does not recommend installing the plugin. What does the company have against the plugin? It makes Internet Explorer less secure.
"With Internet Explorer 8, we made significant advancements and updates to make the browser safer for our customers," a Microsoft spokesperson told Ars. "Given the security issues with plugins in general and Google Chrome in particular, Google Chrome Frame running as a plugin has doubled the attach area for malware and malicious scripts. This is not a risk we would recommend our friends and families take." The spokesperson also referred us to the latest phishing and malware data from NSS Labs, the same security company that found IE8 was the most secure browser in August 2009 via two Microsoft-sponsored reports.