Desktop search is not new: it is already built into the Start menu of Microsoft Windows XP.
However, not everyone is aware it exists, it excludes lots of file types, the results are generally poor, and it is very slow - unless users have indexed their hard drives. Since Microsoft's Indexing Service is obscured three levels deep in the search options, it is a safe bet not many people have.
Some users have turned to third-party programs such as X1 and dtSearch, and more recent free offerings from Copernic and Blinkx. Many more will have wished they could search their hard drives in the way they can search the web with Google.
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