<A target="_blank" href="http://www.pcworld.com/article/205238/windows_xp_your_last_chance_to_get_it_really.html?tk=rss_news">Once again Microsoft is threatening to pull the plug on WinXP</A>. The new end-of-sales date is October 22, 2010. But. A lot of people, especially businesses, aren't eager to upgrade.