Why is the Map Definition Tool (MDT) not part of the official release?
MDT is undergoing an extensive rewrite so that it can fully support all the functionalitity currently available in the MapViewer server. Since this is not completed yet, we are temporarily providing the first beta version of MDT (the one you currently are using) for download from OTN. This MDT lacked sufficient functionality and full support of MapViewer, and hence is not part of our official MapViewer release.