IE 7 hit just the web and the first claims of a vulnerability appeared. It is actually true that there is a vulnerability but not in IE 7 but in the underlying Outlook Express.
For more information, please read Christopher Budd's statement in the MSRC-blog at http://blogs.technet.com/msrc/archive/2006/10/19/information-on-reports-of-ie-7-vulnerability.aspx
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I find IE6 more stable. To the point where I formated and went back!
I actually support Apple macs more than PCs