Came across Apple Support website source code and found the following CSS conditional comments in it.
The code section might mislead some people to believe that the CSS code was supposed to be used for IE8 (nope, IE8 isn’t available yet). What the code really says is that the CSS will only apply for IE which have version number lt (means Lower Then). In essence, it’s covering all major IE version up till version 7 (or 7.xx if there will be any)
* Conditional comments are only tailored for Internet Explorer on Windows and are supported from Explorer 5 onwards.