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Windows 7
Windows 7

The most recent version of Windows Explorer debuted in 2009, inside with Windows 7.

It was the first version to feature a "Libraries" sidebar that allowed users to quickly click through a group of customizable folders.

Last updated August 31 2011: 10:31 AM ET
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Does anyone need Windows 8?

Microsoft's Windows 8 purports to be a PC operating system for every device. But a PC experience may no longer be necessary.