Still continue to use the XP? Threat of malware

A new type of malware “Zeus” was found. It tries to attempt stealing data from user company of Salesforce.com.
One of employee’s private PC was an WinXP machine with old version of Internet Explorer, and it had been infected with subspecies of Zeus.
This episode tells us that continuing to use vulnerable Win XP is too harmful.
http://www.itmedia.co.jp/enterprise/articles/1402/21/news047.html