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Google Unveils Desktop Search, Takes on Microsoft  MOUNTAIN VIEW, Calif. (Reuters) - Google Inc. &lt;A HREF="http://www.reuters.co.uk/financeQuoteLookup.jhtml?ticker=GOOG.O qtype=sym infotype=info qcat=news"&gt;GOOG.O&lt;/A&gt; on  Thursday rolled out a preliminary version of its new desktop  search tool, making the first move against its major  competitors in the race to provide tools for finding  information buried in computer hard drives. 