The IE Team announced last Friday with the release of Windows Vista Beta 2, they will be naming the version of IE7 in Windows Vista “Internet Explorer 7+”. While all versions of IE7 are built from the same code base, there are some important differences in IE7+, most significantly the addition of Windows Vista-only features like Protected Mode, Parental Controls, and improved Network Diagnostics.

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http://blogs.msdn.com/ie/archive/2006/05/26/608255.aspx