IE9 was in the first 48 hours it was available, and 13 million more times since then, although it still commands less than half of a percent of the worldwide market for Web browsers. The 15 million downloads represent 0.38% of the world's total browser usage, and just a fraction of the or so Windows 7 users (IE9 is available only on Vista and Windows 7).
Microsoft lost ground in the browser market in , with all editions of Internet Explorer combined now claiming 58.3% of users, down from 59.2% in October, according to .
Rival Google Chrome claimed most of IE's lost share, upping usage from 8.5% to 9.25% in just one month.
Despite Internet Explorer's continued slide in the browser market, Microsoft Marketing Director Roger Capriotti enthused optimism in a , noting the 15 million download milestone for IE9 as well as numbers that show enterprises moving from IE6 to IE8.