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. These features take advantage of big changes in Windows Vista and weren’t practical to bring downlevel. The IE7+ naming gives us an easy way to refer to this version.
These differences shouldn’t affect most web developers, but if you need to know specifically, you can refer to the OS field of the User-Agent string. The User-Agent strings will have the info you need:
IE7+ running on Windows Vista: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)
IE7 running on Windows XP: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)
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