Microsoft Debuts Desktop Search Tool  SEATTLE (Reuters) - Microsoft Corp. &lt;A HREF="http://www.reuters.co.uk/financeQuoteLookup.jhtml?ticker=MSFT.O qtype=sym infotype=info qcat=news"&gt;MSFT.O&lt;/A&gt; on Monday  unveiled a new, preliminary version of its search tool for  finding documents, e-mail and other files stored on personal  computer hard drives.