Microsoft: To secure IE, upgrade to XP | Tech News on ZDNet: "Microsoft currently commands about 94 percent of the worldwide operating system market measured by software shipments, according to IDC. (That number factors in revenue-producing copies of the open-source Linux operating system, but not free ones).
Of Microsoft's approximately 390 million operating system installations around the world, Windows XP Pro constitutes 26.1 percent, Windows XP Home 24.7 percent, IDC said.
The remaining 49.2 percent is composed of Windows 2000 Professional (17.5 percent), Windows 98 (14.9 percent), Windows ME (6.5 percent), Windows 95 (5.4 percent), and Windows NT Workstation (4.9 percent). That 49.2 percent of Windows users are left out in the cold when it comes to significant updates to IE and other software."