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Sun Micro Posts Narrower Quarterly Loss  SAN FRANCISCO (Reuters) - Network computer maker Sun  Microsystems Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=SUNW.O target=/stocks/quickinfo/fullquote"&gt;SUNW.O&lt;/A&gt; on Thursday posted a narrower  quarterly loss as revenue rose year over year for the second  consecutive quarter after three years of declines, sending  shares slightly higher. 