"By comparison, when Internet Explorer 8 Beta launched in August 2008, we had 1.3 million downloads over the first five days," said Roger Capriotti, a product management lead on the IE team, in a post to a company blog Monday.
Capriotti also boasted that Microsoft's "Beauty of the Web" site had attracted nine million visitors and racked up over 26 million page views in the same period.
Microsoft released the first public beta of IE9 last Wednesday.
Most reviewers have given IE9 a thumbs up, citing its minimalist design, hardware acceleration and tighter integration with Windows 7. Computerworld's Preston Gralla was representative when he concluded that the changes "put IE back as a major competitor in the browser wars."
Web metrics vendors that track browser usage, however, were unable to verify that Microsoft's claim of IE9 beta downloads translated into people using the new browser.
"I don't doubt what Microsoft is saying," said Vince Vizzaccaro, a vice president with Aliso Viejo, Calif.-based Net Applications. "But for last week, IE9 achieved a 0.07% global usage [share]." Net Applications' week ends Saturday, so the 0.07% share includes the first two days, and more, of IE9's availability.
The firm kicked off IE9 usage tracking last week, so there was no available comparison to prior weeks when Microsoft only offered rough-around-the-edges developer previews.
IE9's out-of-the-gate download and usage share totals were less impressive than claims by rivals that have released new finalized, polished browsers in the last two years.
Google's Chrome grabbed 1% of the total browser share shortly after its early September 2008 debut.
Opera Mini accomplished that in spite of the fact that Windows PCs able to run IE9 vastly outnumber in-use iPhones.