Internet Explorer 9 in the final version has indeed been downloaded 2.35 million times in the past 24 hours hours of its making available online, or 4 times the Release Candidate on the same period.
Ryan Gavin, director of marketing and business Internet Explorer, even explains that this represents well over 27 download IE9 per second or more than 240 every 9 seconds.

Even if this figure of 2.35 million downloads in 24 hours can seem overwhelming to some, it is relative compared to the competition. Apple communicated well over 11 million downloads of its browser Safari 4 on three days, and Mozilla over 8 million downloads in 24 hours for its Firefox 3 between 17 and 18 June 2008.

However, it should be noted that Internet Explorer 9 is incompatible with Windows XP while the system still accounts for more than 55% market share worldwide (55.09% market share in February 2011 according to Net Applications), and Windows 7 (23.08%) and Windows Vista (11.0.1%) combined represent 34.09% of the market.