The 4 cdroms I have dl from msdn aa contains all version of Windows Vista. But my license is okay just with business, but I have installed Ultimate without key and it runs. CDs are same as DVD version. Instead of having one install.wim, I have 4 files called install.svm , install2.svm, install3.svm and install4.svm on each cd. I have copy CD2,CD3 and CD4 to CD1 and installed from shared folder, install has been completed correctly.