Windows 2000 has been given nine months to live, as far as OEMs are concerned, and Microsoft is pressuring the PC companies to stop offering dual install Win2K/WinXP systems immediately. Microsoft operating systems magically become more expensive and difficult to obtain as soon as there's a new rev out, but so long as the previous version is still available on new PCs via OEMs, business customers have a relatively simple way to stick with their current OS, rather than having to do an expensive rollout of the replacement.
For more info warp 2... TheRegister.co.uk