<A HREF="http://news.zdnet.com/2100-1009_22-6189961.html?tag=nl.e589">Malicious software targeting OpenOffice.org documents</A> is spreading through multiple operating systems, according to Symantec.

"A new worm is being distributed within malicious OpenOffice documents. The worm can infect Windows, Linux and Mac OS X systems," according to a Symantec Security Response advisory. "Be cautious when handling OpenOffice files from unknown sources."

Apple's Mac OS is not a virus-free platform, said Jan Hruska, who co-founded rival antivirus firm Sophos and was one of the first ever PC antivirus experts.