Mozilla, the open source organisation behind the Firefox web browser, has complained that Windows 7 is too closely integrated with Microsoft's Internet Explorer browser.
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Windows 7 RC1, the release candidate version of the next Windows desktop operating system, is available to download now. Mozilla has downloaded the software and, according to the Financial Times, believes the software giant is using its market position to lock out market competitors, such as Firefox.
Speaking in the FT today, Mitchell Baker, chairwoman of Mozilla, said, "Our initial review suggests this is a blatant use of the Windows operating system to change the market dynamics of browser usage. What we have seen so far is a clear example of why and how Microsoft's Windows monopoly damages competition in related products."
This is not the first time Microsoft has been attacked over a pre-released version of its operating system. Many anti-virus companies were unhappy prior to the launch of Windows Vista because of the anti-virus technology Microsoft had built into the software, which would potentially kill off their products.
Last year the EU fined Microsoft £680m because it had failed to comply with a 2004 order to stop its monopolistic practices. Last month, a group of technology companies including IBM, Sun, Oracle and Nokia joined the European Commission's case against Microsoft for anti-competitive practices.
Microsoft has fought an ongoing battle in the EU and US as a result of integrating Internet Explorer into the Windows operating system. The browser wars in the mid 1990s led to the demise of Microsoft rival Netscape, which was later taken over by the Mozilla foundation and became the basis for Firefox.