Hey, don't dis MS for having different marketing version vs product versions. OS manufacturers are hostage to the same bad 3rd party coding practices that browsers browsers are with the UA string. You get stuck in a position where changing version number can become actually scary (I recall Safari 2.0.4 having a bunch of issues because the addition of the character "4" broke a wide array of sites, because if your user agent string contains "4" you are netscape 4, and supported document.layers and JavaScript Style Sheets)