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Not very in depth but it's a start. Also, who uses WMV for streaming video? I am amazed that Microsoft didn't use Flash for that.
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Just as it was the case for Windows Vista, Windows 7’s main rival is not Linux, Mac OS X or any competitor operating system, but the Windows XP platform. Because of Microsoft’s support lifecycle for its products, Windows OSes often overlap. In this context, Microsoft needs to labor continuously to convince users of older releases of Windows to upgrade to the latest iteration. This is without a doubt the seed that generated the Windows XP vs. Windows 7 comparison put together by Microsoft.
The Windows XP vs. Windows 7 video is available on Windows.com for your viewing pleasure. In addition, the software giant has also compared the two operating systems side by side in a list designed to highlight the new and evolved features of Windows 7 over what Vista and XP had to offer before it.
According to statistics from Net Applications, Windows 7 has grown to a market share of 13.70% since the October 22nd, 2009 launch, taking Vista down to 14.68% and XP to 62.43%. Obviously, there is still enough place for Windows 7 to increase its share of the OS market worldwide, especially if the platform continues to erode the dominance of XP.
Windows XP vs. Windows 7, a Microsoft Perspective - Video available from the Redmond company - Softpedia
Not very in depth but it's a start. Also, who uses WMV for streaming video? I am amazed that Microsoft didn't use Flash for that.