IBM Net Flat; Says Confident on Outlook  NEW YORK (Reuters) - International Business Machines Corp.  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=IBM.N target=/stocks/quickinfo/fullquote"&gt;IBM.N&lt;/A&gt; on Monday posted a flat quarterly net profit, weighed  down by a legal settlement, but the world's largest computer  company sounded a confident outlook and its shares rose 2.3  percent after-hours.