"For competitors, this will allow them to compete on all fronts," added Barrett.
Microsoft typically bundles the Explorer browser with the Windows operating system. Windows 7, expected to be released later this year or early next, will include Explorer 8.
But the pairing of the world's most popular computer OS with its most heavily used Web browser has prompted cries of foul from Microsoft rivals and competition watchdogs.
The European Commission said in January that it's eyeing the possibility that the company is violating monopoly laws by failing to make its products interoperable with competitors' offerings and by bundling Explorer with Windows.
The EU has previously levied millions of dollars in fines on Microsoft for past monopoly violations.
But a Microsoft official, in a blog post Friday, said the company's decision to offer what is, in effect, an Explorer off button has less to do with competitive concerns than it does offering users more control over their computing environment.
"We've received a lot of suggestions about features that you would like to turn on or off using your own criterion for choice," wrote Windows 7 group program manager Jack Mayo.
To disable Explorer in Windows 7, users can access a switch within a folder called Windows Features that's part of the Control Panel menu, according to Mayo.

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Windows 7 screen shot (Click for larger image and for full photo gallery)
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