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Microsoft's IE Loses Almost 6.5% of the Browser Market in the Last 12 Months

Park City, UT - Janco and the IT Productivity Center have just released its May 2009 Browser and Operating System Market Share White Paper. The major findings are that Microsoft's IE browser market share has has fallen to 66.81% versus 73.23% in May 2008 and 76.40% in March 2008; Firefox has maintained its number 2 browser position and is used by almost 19.55% of all users; Google, with its Desktop and Chrome offerings, has just over 5.4% of the market; and acceptance of Vista continues to be below Microsoft's expectation.

Victor Janulaitis, the CEO of Janco said, “The major browser findings of the study are: Microsoft's Internet Explorer's market share has stabilized and Google's Chrome is a non-event. ” He added, ". . . IE 8 has been released but its acceptance is slow at best. " The White Paper has a detailed historical analysis of browser market share since 1997. The findings are supported by data which is provided both graphically and in spreadsheet format.

On the Operating System front, Microsoft's Vista is installed on just under 1 in 5 desktops (17.34%) after over 30 months since Vista's first release (RC1). Janulaitis added, " Vista proves that large companies like Microsoft can and do make huge blunders in technology. Microsoft can no longer count on moving users to new products like Vista as quickly as they want. "

A summary of Janco's white paper can be found on the Janco's web site ( and the IT Productivity Center's web site (http:/

Janco has collected consistent data on browser activity since September 1997. The data is captured from commercial sites that focus on business-to-business activity. The full white paper with excel spread sheets is available for $249.

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Microsoft's Browser Market Share History

IE Market Share History

The top five browser market share rankings are: 1 - Microsoft's IE - 66.81%; 2 - Firefox - 19.55%; 3 - Google; 5.41 - Netscape - 1.47%; 5 - Mozilla - 1.38%.

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One additional finding in the report is that Microsoft's Vista now has 17.34% of the OS market share of business and enterprise users who browse the Internet.

Operating Systems Market Share for Internet Users

Vista OS Market Share
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