Symantec to Buy Veritas for \$13.5 Billion  NEW YORK/SAN FRANCISCO (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.