In big business, stealing customers for an incremental increase in market share against competitors happens all the time; after all, when there aren't new customers to be had, you can only attract existing ones. Times are rough for some antispyware vendors now that the market includes big-name vendors CA, McAfee, Microsoft, Symantec, Trend Micro, and ZoneAlarm--all of them providing antispyware solutions within their antivirus products or Internet security suites. And with Microsoft bundling its Windows Defender product free within Windows Vista and Windows XP SP2, pure-play antispyware vendors such as PCTools, Sunbelt, and Webroot are all <A HREF="http://reviews.cnet.com/4520-3513_7-6729554-1.html?tag=nl.e501">scrambling for a bigger piece of the pie,</A> and some of that scrambling has turned downright nasty.