For ColdFusion MX, all development work required to support Windows 2003 and IIS 6.0 has been completed and is currently undergoing testing. This work will be included in the next update to ColdFusion MX (scheduled for release this summer), which will provide out-of-the-box support for Windows 2003.
Macromedia is still deciding whether to develop such support for ColdFusion 5 and JRun 3.1.
You can find out more at the following URL: