The Mocbot worm attacks machines running Windows 2000 or XP that only have Service Pack 1 installed.

BBC: NEWS | Technology | Hackers target latest Windows fix

Why, that would be everyone using Windows XP and 2000 because only IE 8 and lower are supported on those operating systems.

FORBES: Another Reason to Get Rid of Internet Explorer

When the iPlayer first launched the BBC was criticised for producing versions that only worked with Microsoft's Windows XP and which used Microsoft's digital rights management (DRM) system to enforce viewing restrictions.

BBC: iPlayer now available on Mac

Hard to believe, but it was 10 years ago today, October 25, 2001, that Microsoft introduced Windows XP, an operating system so successful that users today promise to switch away from it only when you pry their cold, dead fingers off their mouse.

FORBES: Happy 10th Birthday, Windows XP! Why We Still Love You

During the entire hour-plus-long keynote, the word "Vista" was only uttered once, and then only in the context of Windows Live compatibility, and in the same quick breath as Windows XP and Windows 7.

FORBES: Magazine Article