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;,  the top global security software maker, on Thursday said it  will buy data management software company 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, expanding into the data  storage and recovery business.