Microsoft's Internet Explorer has been named one of <A HREF="http://news.zdnet.com/2100-1009_22-6135844.html?tag=nl.r23660">the Internet's top 20 hacker targets</A> by a leading security organization. The SANS Institute also said Wednesday that Microsoft Office and Windows Libraries and Services are some of the most vulnerable applications available on computers today. But Microsoft was not alone in the annual list, released Wednesday. Apple Computer's Mac OS X was also cataloged, along with "configuration weaknesses" in Unix.