Symantec to Buy Veritas for \$13.5 Billion  NEW YORK (Reuters) - Symantec Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=SYMC.O target=/stocks/quickinfo/fullquote"&gt;SYMC.O&lt;/A&gt;, a maker of  security software, on Thursday said it would buy storage  software maker Veritas Software Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=VRTS.O target=/stocks/quickinfo/fullquote"&gt;VRTS.O&lt;/A&gt; for \$13.5  billion, creating the world's fourth-largest software company.