Copernic Desktop Search Takes Aim at Microsoft  SAN FRANCISCO (Reuters) - Privately held Copernic  Technologies on Tuesday released free desktop search software  ahead of expected offerings from 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; and  others in a move some see as a test of the product's market  viability.